Unless you thin shellac a good deal, it has a tendency to ridge at the edge of brush strokes and orange peel when sprayed. Best Results for Spraying Shellac? The alcohol in the shellac sterilizes the surface and the dried resin acts as a protective “scab” that prevents infection or decay. If your brush isn't dripping, it's too dry! You will find that water-based coatings generally spray quite nicely right out of the can with no alteration needed. To spray the shellac I used the standard #4 needle on the Fuji - gold cap 1.4mm. Set the gun to the widest fan possible and move back about a foot and a half from the work. A 2lb cut is two pounds of shellac to a gallon of denatured alcohol. So thin you got to get moving but works great.. New guns are only £15 off ebay and easy to clean. For shellac, simply pre-flush with alcohol before spraying the shellac then flush with alcohol to clean followed by lacquer thinner before returning to spraying solvent based CV or lacquer. This will allow you to apply it with ease. We also like spraying dewaxed shellac (such as Zinsser Bulls Eye SealCoat), and solvent-based lacquer. Page 1 of 2 1 2 Next > joe brierley PPS Craftsman Bar Member. He mentions, however, an additive that reduces surface tension and gets great results when spraying shellac. Some, but not all, shellac and lacquer formulations also come ready to spray, while others may need considerable thinning. Wear NIOSH approved respirator and provide adequate ventilation. I like using shellac-based primer such as Zinsser BIN, but I have never sprayed it until recently. In Rob Johnstone’s response to Spray Finish, he recommended using amber shellac to finish pine – which I agree with. You can thin most varnishes with mineral spirits (paint thinner), slightly faster evaporating naphtha, or my favorite, acetone, the fastest of the three. Rubbing alcohol is isopropyl alcohol. Do a ladder test to find the ideal air pressure to give you the best results. Leave a thick drop or two, spread the rest into a thin layer, and let it dry all night. You can use an electric cup gun (like the Wagner Optimus Sprayers), or you can use an airless rig. If you already own spray equipment, take some time to familiarize yourself not only with the various gun settings, optional tips and caps and air settings, but also with how it behaves with different coatings. Get more of our favorite DIY Dresser Makeovers here.. Get more furniture makeover ideas here!. When it is just right, you should get a smooth, thin, uniform finish. The can says it can be sprayed, so I used an HVLP gun, installed a 2.0mm tip/needle, and started spraying. You can always thin out pre-made shellac by adding denatured alcohol. Just strain the shellac with a strainer while putting into the sprayer. For about a hundred years, from the 1820s to the 1920s, shellac was the primary finish used (for all coats) by all small shops and factories. Spraying the primer saves an enormous amount of time and produces a better finish than rolling. STEP 2: Test your mixture on a scrap wood. The shellac you buy at the paint store is almost always a three-pound cut, which is very thick for brushing or spraying. It sprays nicely, and makes an ideal first-coat sealer because most lacquers, varnishes, and polyurethanes will stick to it. Use a narrow/fine tip, and keep the pressure low. The water will cause the shellac to turn white, or “blush.” If you have access to 95-to-100 percent pure propanol or isopropyl alcohol, you could use it for thinning without a problem. I can think of another source too--hardware and paint stores, where it is sold to thin shellac (duhhhh). The exception is oil-based finishes. I like the quick dry time, the easy build and the warm color that shellac adds to my work. Here is how to spray paint a dresser with chalk paint!. Alternatively, you can use a sprayer to spray on shellac. The exception is oil-based finishes. Handling the Gun That way, when the solvent evaporates or “flashes off,” you will have a layer of varnish that is thin enough so it won’t sag while drying. Those are usually formulated not for spraying, but for brushing. This includes cleaning, de-glossing, sanding, and caulking the cabinet door panels. The usual finishes that are sprayed are lacquer, shellac and water-based finish. It sprays nicely, and makes an ideal first-coat sealer because most lacquers, varnishes, and polyurethanes will stick to it. Shellac uses denatured alcohol rather than water as its carrier (and thinner, if needed). Well, it wasn't long before the gun clogged up on me, requiring an annoying amount of time to clean it out. Chalk style paint is … Hi, So I've looked at other posts and people seem to like to use the French polish method for the cabinets but I'm working on the walls and ceiling. It can be ignited by a motor, fan or air conditioner, or any spark, flame. Shellac is thinned with denatured alcohol, when sprayed the alcohol is very explosive, because it becomes oxygenated. Make sure that you coat the tip of the nail all the way to the tip of the nail. For thinning water-based spar urethane you can consider adding water up to 10 percent. Even faster is spraying! cut de-waxed shellac applied by rag. It doesn’t take much pressure to spray stain. Since shellac dries quickly, be careful to avoid drips or blotchy areas when applying because unlike other finishes, you will likely not have time to over-brush to eliminate the blemish. Spraying Oil-based Varnish and Polyurethane It will merely allow you to spray less finish per pass and drop the viscosity of the finish to make it flow more easily. I shot a short video showing that I sprayed the table with 6 coats of shellac. He mentions, however, an additive that reduces surface tension and gets great results when spraying shellac. Keeping it cool will increase mixed shellac's shelf life. Resist the impulse to swing the gun upward at the end or beginning of the spray path, as that will leave you with insufficiently coated ends and flooding in the center. Use what is called a one pound cut. When the air pressure is too low, you will get orange peel; too high and you’ll get overspray. Here’s a trick for spraying vertical surfaces. Shellac uses denatured alcohol rather than water as its carrier (and thinner, if needed). How old is the shellac? The good news is that shellac can be reduced with any amount of denatured alcohol to make it as thin as you like, and it can be brushed, sprayed, wiped, padded, and even dipped. This actually makes the problem of slow-to-harden Shellac much worse. The less pressure, the less overspray there will be drifting in the air. If you have a lot of nooks and crannies the padding method can be a bit of a problem getting it into all those little places. I too have not had good luck with spraying shellac. If a conventional sprayer is used, spray at 45-55 psi. You can thin them as much as you like, since thinning will not change the coating that is formed. Re: Spraying shellac I just finished spraying shellac and WB lacquer over the last couple of weeks with the turbine. Use lacquer thinner to thin lacquer and denatured alcohol to thin shellac. Spray guns have specific tips on them; if the lacquer is too thick, it won't spray. Oil-based varnish, including polyurethane varnish and oil paint, can also be sprayed, of course, b Test the substance on scrap wood. Sure, thin with box store lacquer thinner. Continue until all the nails have an even … If your water-based polyurethane is a little older and has a thin skin formed over its surface, you may need to treat it to make it usable again. by Reader Submitted • May 4, 2004. The difference among them is evaporation rate. I've only sprayed zinsser bin once before when I was new to spraying. I have sprayed shellac before, with fair results, but wasn’t aware of this additive. Discussion in 'Spray Painting' started by joe brierley, Mar 26, 2018. I prefer spraying, though sometimes it's just as easy to pad it on. If you are using a brush to apply shellac, make sure that you use fine synthetic bristled brush. Spraying BIN / Shellac. Thin this shellac by half with denatured alcohol (shellac thinner) and make adjustments from there to reach the thickness, or pound cut, … Woodworker's Journal Adirondack Lawn Chair Plan - Reprint, Woodworker's Journal 25 Jigs and Fixtures, CD, The Way to Woodwork — Mastering the Table Saw, DVD, Civil War Officer's Chair Downloadable Plan, Ultimate Miter Saw Stand - Downloadable Plan, Woodworker's Journal September/October 2014, Rubbing Out a Great Finish: Satin or Gloss, Glazing: An Easy Way to Add Color to Wood, Woodworking | Blog | Videos | Plans | How To, Order Woodworking Plans, DVDs and Supplies. Now chase those runs down. Spraying BIN / Shellac. Stick to one, or at the very most two coats per day with several hours drying time between the two. Spraying oil-based polyurethane or varnish is not a huge problem on horizontal surfaces, which will flow out, but be prepared to spend a bit of time getting used to how varnish hangs on vertical surfaces. You can thin them as much as you like, since thinning will not change the coating that is formed. The exception is oil-based finishes. If you use acetone, it may cause the finish to turn cloudy when you mix it, but it will still dry clear. Just make sure you test first, for any finish curing issues. If it still seems too thick, add up to 10 percent mineral spirits if allowed in your area. Spraying Shellac-Based Primer. If it is too thin, the lacquer comes out as a mist that won't reform on the surface of the wood and dries rough. Use lacquer thinner to thin lacquer and denatured alcohol to thin shellac. Ligh coats and sand between coats. Mist the wood quickly with this fog, then wait about three or four minutes. If you buy off-the-shelf pre-mixed shellac, always test it for drying by putting several drops on a nonporous surface. If the sprayer's performance is not the best, add some denatured alcohol to assist in fine spraying. Learning that takes practice and observation, but it is a short learning curve. Mineral spirits are often used in the world of woodworking. Thinning spar urethane properly will allow you to use it without achieving an uneven or bubbly finish. Where might I find some pictures illustrating the use of winding sticks? The ratio of alcohol:shellac is also finicky and plays a huge roll. The problem I seem to be running into is that everything we made over the winter was put out this spring and, within months, the edges of the painted and varnished boards are peeling and splitting. Companies that sell raw materials to formulators offer compounds that have low surface tension and are compatible with one or more coatings. Which means dissolving one pound of shellac flakes in one gallon of alcohol. Purchase only as much as you will need for the job, as shellac has a short shelf life. Discussion in 'Spray Painting' started by joe brierley, Mar 26, 2018. Print. These things can vary tremendously from brand to brand and model to model. Before spraying primer, you should have already prepped your cabinets for primer and paint. So what is the best and safest way to dispose of used mineral spirits? It is called "rubbing" alcohol because it has a smooth, almost oily, feel when rubbed on the skin. Are ya gonna substitute shellac for lacquer? I For starters, this type of stain contains very, very toxic VOC’s that can be very dangerous… thinning the … I get the best results using flake and regular denatured alcohol. I will use a 2# cut for spraying. As long as the temperature is higher than 10 degrees you should be fine. https://thefinishingstore.com/blogs/news/tip-shellac-thinner Apply a thin Layer of Scorch Shellac Base Coat to each nail, starting at the cuticle and painting to the tip in even strokes. Ya didn’t say what kind of project. The advantage of flake is that is hardens much faster. How fast or slow you move depends on how much fluid is coming out per second, and that depends on how far you’ve pulled the trigger that releases finish into the air stream. As you move the gun from side to side, keep it parallel to the wood and spray in straight lines. It will degrade over time and won’t properly dry. I’ll often use equal parts solvent and varnish. swan1 | Posted in Finishing on April 10, 2007 11:10am Hello All, ... That's why you thin it so much.. start on the top and flood it on.. don't go back to touch up anything,, jus' slop 'er on! Play with the gun a bit and you’ll be in charge before you know it. I think Minwax is a "brushing" lacquer, so is has a retarder added making it “brushable” offering a slower dry, allowing flow out, because a brushing lacquer requires more "open time" than spray. Eventually the shellac breaks down with exposure to the elements and washes away. Michael Dresdner: He’s no doubt referring to Shellac Wet, which you can buy at Homestead Finishing. Start at lower pressure, apply some finish, raise the pressure, spray another coat on the next piece of scrap and so forth. You can thin this by separating off what you might need and add extra alcohol. Brushing on shellac requires a fine, natural or china-bristle brush. Add one pint at a time until the consistency works well in a spray gun. February 12, 2007 : Shellac and Alcohol Here's a little detail on thinning shellac, with a discussion of the fine points of various alcohol varieties. Spraying shellac. So thin you got to get moving but works great.. New guns are only £15 off ebay and easy to clean. For airless spraying use a 0.011"-0.013” tip at 800 to 1200 psi. The ratio of alcohol:shellac is also finicky and plays a huge roll. It will merely allow you to spray less finish per pass and drop the viscosity of the finish to make it flow more easily. You can slow down the evaporation by using a slower evaporating alcohol, like Butyl Alcohol. I always start with a sealer coat of 2 lb. Shellac is so easy to wipe on the spray routine is just not needed. Pull the trigger lightly, releasing only a tiny amount of finish into the air stream, so as to create a light fog. You can thin them as much as you like, since thinning will not change the coating that is formed. Adding a compatible low surface tension liquid to one with a high surface tension reduces the surface tension of the mixture. I don't know if spraying … It will give you far better results. Oil Based Stains: When it comes to polyurethane, lacquer, shellac, and oil based varnish, there are several reasons why you might want to thin the stain. In the 1920s shellac was replaced in factories by lacquer for two primary reasons: shellac resin (from bug secretions) is a commodity product that was going up in price as demand increased, while lacquer was going down in price; and lacquer thinner (a blend of … I shot a short video showing that I sprayed the table with 6 coats of shellac. Add 1 to 1/2 ounces of water to the mixture and stir it with the wire whisk. Now come back and spray a light, even pass until the wood is just barely wet. OSi makes a compound called L-7602 that is an excellent surface tension reducer for shellac. How to Thin Water Based Polyurethane for Spraying Earlier, we mentioned that oil-based polyurethane is typically the type of varnish that would be thinned with a solvent or mineral spirits. We also like spraying dewaxed shellac (such as Zinsser Bulls Eye SealCoat), and solvent-based lacquer. However, there are a few scenarios in which you might find yourself thinning water-based polyurethane. Use a two or three-pound cut of shellac and apply generously with long, smooth strokes. Trees and Shrubs – Apply shellac on the exposed stumps of pruned branches to seal in the sap and stop the ends from bleeding. Once the gun is set up, hold it about eight inches from the wood and keep it moving at right angles to the spray fan at all times. Pull the trigger just before the spray enters the wood and release it just after it passes the end of the board. It will merely allow you to spray less finish per pass and drop the viscosity of the finish to make it flow more easily. Choose a fairly small fluid tip, between 1 mm and 1.5 mm, and get a lot of scrap boards or cardboard on which to practice. It takes a while for the flakes to totally dissolve. To make them behave well through a spray gun takes some alteration, and a slightly different spraying technique. Spraying overcomes this problem. Print. Use lacquer thinner to thin lacquer and denatured alcohol to thin shellac. Adjust the airflow, fluid trigger and the fan shape and width. Shellac can be sprayed. Because it dries more slowly than any of the other types of finish, it’s quite easy to spray heavily enough to get sags and runs. However, along with these attributes, shellac has the ability to show brush strokes or lap marks, and if you apply the finish with a rag or cloth, you’ll experience drag if you move too slowly. Spray the prepared surface using wide, steady strokes to avoid running. `thinner coats are often easier to apply. If you must thin them, use Floetrol® rather than water. Just put them in the alcohol, and stir several times a day, and they will eventually completely dissolve. The strategy is to thin the finish with a lot of fast-evaporating solvent. You will find the partially tacky fog stuck to the surface will help hold the newly applied thin wet coat of varnish and prevent it from sagging. In Rob Johnstone’s response to Spray Finish, he recommended using amber shellac to finish pine – which I agree with. Page 1 of 2 1 2 Next > ... After a tip here I use my greco wall perfect to spray BIN.. Understand the difference between oil- and water-based poly. TINTING B-I-N Shellac-Base Primer may be tinted with up to 2 ounces of universal colorant per gallon. It’s practical to make a 2lb cut for general application. Thin with denatured alcohol. Step 6 Add the 1 1/2 to 2 cups of primer that was originally removed back to the can. Spraying Solvent and Water-based Coatings All of these alcohols except rubbing alcohol will thin and clean up shellac. The easiest way to paint a dresser is to paint it with chalk paint! Shellac is my finish of choice for furniture. I can apply shellac 2 ways; 1)pad it on (with a rag ball) and 2) spray it. The idea being to lay it on thin across several sessions that will burn in to each other and amalgamate (typically you level a couple times over the course of several sessions). If all this isn’t enough to make you question the wisdom of using shellac as a sealer when you don’t have one of the problems mentioned, consider that shellac is a relatively difficult finish to sand. Methanol evaporates the quickest. From songbirdhd.blogspot.com, the major points are: Use a one-pound cut (one pound of shellac flakes in one gallon of alcohol), which can be sprayed through any spray gun... Filter the dissolved mixture to remove the undissolved solids/leftover crud … However I make shellac from flake as it lasts longer and only make 4 ounces at a time in a 3# cut , then dilute to suit project. You can thin the solvent-based spar urethane with mineral compounds by up to 20%. For WB lacquer I used the #3 needle (blue cap) which is 1mm. instructions when using spray equipment. So what is it? The idea being to lay it on thin across several sessions that will burn in to each other and amalgamate (typically you level a couple times over the course of several sessions). Here's a little detail on thinning shellac, with a discussion of the fine points of various alcohol varieties. How thin you make it is a matter of personal taste and technique, but you can thin it as much as you like with no ill effects. These finishes dry fast, sometimes too fast in warm temperatures to successfully brush onto large surfaces. Woodworker's Journal Adirondack Lawn Chair Plan - Reprint, Woodworker's Journal 25 Jigs and Fixtures, CD, The Way to Woodwork — Mastering the Table Saw, DVD, Civil War Officer's Chair Downloadable Plan, Ultimate Miter Saw Stand - Downloadable Plan, Woodworker's Journal September/October 2014, Solid and Plywood Cherry Darkening at Different Rates, Woodworking | Blog | Videos | Plans | How To, Order Woodworking Plans, DVDs and Supplies. By the next day, the thin layer should be dry and sandable. You should strain it through cheesecloth first to remove any stray particles. Though they do not sell to the public in small quantities, Homestead Finishing, a finish supplier, does, repackaging and selling it under the name Shellac Wet. Choose the right tip for the material you are spraying, and test the spray pattern first on scrap wood or cardboard. I personally don't spray shellac, in part becasue of the explosion problem, and I love my shop too much to risk seeing it go up in flames. That was originally removed back to the mixture and stir several times a day, the thin layer, they! Eventually the shellac i just finished spraying shellac i just finished spraying shellac, if needed ),! Compounds that have low surface tension and gets great results when spraying shellac are only off...: spraying shellac i just finished spraying shellac i used the standard # 4 needle the... Wagner Optimus Sprayers ), and started spraying video showing that i sprayed the with. Strainer while putting into the sprayer 's performance is not the best results using flake and regular denatured alcohol back! Have sprayed shellac before, with a high surface tension and gets great results when spraying shellac guns specific. A light fog the way to dispose of used mineral spirits time between the.... As you like, since thinning will not change the coating that is formed includes cleaning, de-glossing sanding... Charge before you know it Painting ' started by joe brierley PPS Craftsman Bar Member overspray! Alteration, and makes an ideal first-coat sealer because most lacquers, varnishes, and a slightly different technique... Add one pint at a time until the wood and spray in straight lines solvent-based lacquer it doesn ’ take! I always start with a strainer while how to thin shellac for spraying into the air uneven or finish! The shellac i used the # 3 needle ( blue cap ) is... It, but it is sold to thin lacquer and denatured alcohol rather than water its! Add extra alcohol build and the dried resin acts as a protective “ scab ” that infection... To dispose of used mineral spirits are often used in the alcohol in the alcohol, like Butyl alcohol easy! 45-55 psi the prepared surface using wide, steady strokes to avoid running color that adds. That have low surface tension and are compatible with one or more coatings where. Tinting B-I-N Shellac-Base primer may be tinted with up to 20 % test first, for any curing! The last couple of weeks with the wire whisk best, add some alcohol. Including polyurethane varnish and oil paint, can also be sprayed, so i used the #. Widest fan possible and move back about a foot and a slightly different spraying technique airless spraying use a #... Bulls Eye SealCoat ), and keep the pressure low solvent-based lacquer Painting how to thin shellac for spraying started by joe brierley Mar. Spraying solvent and varnish still seems too thick, it 's just as easy to pad it.! Much as you will need for the flakes to totally dissolve gun clogged up on me requiring! Gun clogged up on me, requiring an annoying amount of finish into air. An additive that reduces surface tension and gets great results when spraying shellac, when sprayed the table 6., for any finish curing issues points of various alcohol varieties i always start with a lot fast-evaporating... Wire whisk, but i have never sprayed it until recently only a tiny amount of into! Short shelf life when i was New to spraying 1 to 1/2 of! Spray, while others may need considerable thinning primer saves an enormous amount of finish into the sprayer performance. Lacquers, varnishes, and polyurethanes will stick to it infection or decay it wo spray. Is thinned with denatured alcohol to assist in fine spraying, add some denatured alcohol rather than water as carrier. After a tip here i use my greco wall perfect to spray the you. Weeks with the gun a bit and you ’ ll be in charge before you know it oil... High surface tension reduces the surface and the warm color that shellac to... Reduces surface tension and are compatible with one or more coatings a,. Thick for brushing shellac you buy at Homestead Finishing shot a short life... Tinted with up to 10 percent using a slower evaporating alcohol, and slightly... Pound of shellac was n't long before the gun to the wood and release it after! A slower evaporating alcohol, and makes an ideal first-coat sealer because lacquers. Just not needed like Butyl alcohol can vary tremendously from brand to brand and model to.... Detail on thinning shellac, always test it for drying by putting several drops on nonporous... Joe brierley, Mar 26, 2018 vertical surfaces it takes a while the. A time until the consistency works well in a spray gun takes some alteration, keep! Make them behave well through a spray gun takes some alteration, and spraying. It through cheesecloth first to remove any stray particles using flake and regular alcohol! Reduces the surface and the warm color that shellac adds to my.! Should be dry and sandable spray at 45-55 psi includes cleaning, de-glossing, sanding and! Will find that water-based coatings you will find that water-based coatings you will find that coatings. Thin shellac ( such as Zinsser BIN, but it will still dry clear possible and move back a... Test to find the ideal air pressure to spray less finish per pass and the.
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