Since the advent of VOC laws, the material you spray has changed too, so it’s even more critical to choose the spray gun based on what you’ll spray with it. It is widely used in the automotive industry because of its durability. What does this have to do with it, you ask? The information sheet I received about it says to use a NIOSH-approved activated Charcoal cartridge respirator. HIGH PERFORMANCE URETHANE SINGLE STAGE SERIES 2.8 VOC -QUART #8030-04 Premium Low VOC Reducer #8040-04 2.8 VOC High Performance Urethane Paint Catalyst. Single stage paints have the color and gloss mixed in together, and this type was the standard up until about 20 years ago (although you’ll still find the occasional car newer than that with single stage paint). Eastwood’s Single-Stage Urethane Topcoats may be force dried at 140°F for 40 minutes after a 5-10 minute ﬂ ash. Even between single-stage and base coat/clearcoat urethane paints, some differences exist. I asked what fluid nozzle he was using, and he told me 1.3. Spray the mixture on the surface in the same way as you sprayed the primer. This prevents dry spray and orange peel. Remember when you were a kid and you stuck a potato in the tailpipe of you buddy’s car, and it wouldn’t run properly? "Even single-stage urethane paints provide a deep paint finish without the expense." So now you have the right spray gun for the job and it’s equipped with the recommended nozzle setup, but you’re still not getting the optimum performance. Primer surfacers require a much larger fluid nozzle. This is the worst part about painting, but thorough cleaning after painting is critical to ensuring your next job will go smoothly. When I painted the steering wheel, the finish was nice even without buffing. Allow sufﬁ cient time for vehicle to cool down following bake cycle. But now, with HVLP technology, you need to hold the gun 6 to 8 inches from the surface to maintain control of the fan and of the material you’re spraying. You have your Acrylic Enamel Urethane and Synthetic Enamel systems. Some painters don’t hold the gun perpendicular to the surface until they’ve passed the end of the panel. Urethane paint was first created in the mid-1960s, utilizing the newly-developed plastics technology of that era, to be superior to enamel paint in terms of durability. Mixing Urethane Multi-Stage (Base Coat Ratio 4:1 Paint/Activator, Clear Coat Ratio 4:1 Paint/Hardener) Base Coat. Having a small-diameter hose and couplings is akin to sticking a potato in the tailpipe. Many times, this happens after you buy a new spray gun, especially if it’s a different brand from the one you were using. So if the bodyman is running a D/A sander or airfile while you’re painting, there’s a good chance you won’t have enough air to run your spray gun – and your job will suffer the consequences. Urethane Single Stage Paints When urethane paints are applied in stages, the last stage is applying the "clear coat" or layer of protector design to add to the sheen of the paint and protect it from damage. For example, there are spray guns designed especially to spray clearcoats. The hardener allows the paint to dry faster and more crisply, so sanding will be more effective earlier on in the process. Measure urethane paint thinner based on your ideal thinning ratio. Actually, you’ll achieve the best results when you refer to the paint manufacturers technical data sheets for that particular product you’re spraying. Again, this is a general rule of thumb, and many painters go against the norm and get outstanding results from unorthodox methods. Right guys? Others are designed for primers and other heavy-bodied materials. Urethane Dry Spray is a problem that occurs during painting and it can be a result of improper chemical mixing or technique while spraying. Air requirements for a spray gun can range from 2 or 3 CFM for a small touchup gun to as much as 18 CFM for some gravity-feed or siphon guns. The trim coverage wasn't great and it took 2 cans for 1 coat. Urethane painted surfaces are minimally affected by ultraviolet rays, making the paint a good choice for outdoor surfaces. Basecoats should be sprayed with a 1.4 to 1.6 nozzle. Sealers and single-stage urethanes should be sprayed with 1.4 to 1.6 nozzles. Even though your spray gun may only use 30 PSI of air, it may exceed the CFM capacity of your compressor. Urethane is reduced with floetrol. As a red-blooded American male, I just couldn’t resist. Stay up to date with the latest BodyShop Business news. Is buffing/polishing required for acrylic enamel and single stage urethane … If you’re using a 1/4-inch air hose, you’re severely hampering air flow and should consider at least a 3/8-inch inner-diameter air hose with high-flow couplers and fittings. The air consumption of a spray gun is measured by cubic feet per minute (CFM). If you choose to use a clear coat, be sure to do any necessary sanding first, since afterward you will be forced to sand through the clear coat itself. He figured that with the primer being high solids, he needed a smaller fluid nozzle when, in reality, he needed at least a 1.7 nozzle. Give me a break,” you say. Details about AUTO BODY SHOP SPRAY PAINT SINGLE STAGE URETHANE RESTRATION PAINT 12 oz.CAN. A vehicle painted with black single-stage will appear darker than a vehicle with black basecoat/clearcoat. 1 can was enough for a single coat. Prior to this, he owned a company involved in the manufacture of paint products. If you're using a full gallon of paint at a 4:1:1 ratio, then 32 ounces of reducer is equal to 1/4 of your paint … Toward the end of the panel, they tend to stop the gun and twist their wrist to point the gun to the end of the panel instead of moving their entire arm the length of the panel (much like a brush-stroke-type of method, as if they were painting with a brush). There’s nothing more disconcerting than laying down a beautiful finish and when you start to lay down the final coat of clear, a glob of basecoat comes out and lands right in the middle of the clear. If you’re spraying single-stage black in a home shop, you don’t have to worry too much about bits of light-colored dust appearing in the paint. Restoration Shop (AU) Acrylic Urethane Paint System AU is a High-Performance Professional Easy-To-Use Single-Stage High Gloss Paint Coating System that is Designed for Overall Automotive Refinishing but is also used as a Fleet and Industrial Equipment Coating. At the very least, you should consider one spray gun dedicated to spraying only clearcoats. They’ve thoroughly tested their products and identified the best needle nozzle combination for each product. See that article in the September issue of BSB.). It also has the advantage of being a surface that can be applied over enamel if the enamel-painted surface is prepared first. Having a dedicated clearcoat gun will eliminate this from happening. You don’t need a new spray gun (even though you may want one) to get the most from your gun and to create a great paint job. It came out great, very little orange peel and no post paint work. Wet sanding uses a mixture of wet grit and sandpaper to sand down these flaws into a smooth surface. Watch the latest BodyShop Business video. This is not part of the urethane process, but it is common even with single-stage urethane paints. The final step in achieving the best job possible is proper handling of the spray gun. Actually, a skillful painter with the correct spray gun (notice I said “correct,” not “new) is the right recipe for an outstanding paint job. Sealers and single-stage urethanes should be sprayed with 1.4 to 1.6 nozzles. I was really worried about using the spray max paint after using the interior trim paint. Understanding product and what’s needed to apply that product is very important, and many times problems can be attributed to not being aware of the basic fundamentals of choosing proper equipment for the product you’re spraying. How much air do you need?”, Want to read more on spray guns? The problem normally shows up as a patch or section of the work and often happens in areas where you are not watching as closely as you should. Measure your urethane paint using liquid measuring cups and pour the paint into a large bucket for mixing. Condition: New. If you check the output for most 5-hp compressors, it’s around 14 CFM max. All three of these paint stages can result in paint defects that will effect the overall paint job. Complete Urethane Acrylic Single Stage car paint kit offers the greatest durability and gloss in a single stage paint system. Gary Stone, a former Vermont-based restorer, said he prefers single-stage paints for solid … Many types of urethane paints require that you paint your car in stages, applying several different coats that must then be allowed to dry before the next coat is added. Thick primer surfacers won’t go through a small fluid nozzle so, consequently, no material is deposited on the repair area. The average for most popular guns is around 12. “Come on. My recommendation is that beginners and DIY enthusiasts who want to maximize cost effectiveness and minimize the time needed to spray a car use single stage paints. If you go too hard on this you may go … I know painters who have one gun with a 1.6 nozzle setup that they spray everything from primer to clearcoat out of. Reducers help thin out the paint for easier misting with a spray gun. But those of you who have a bit more skill, or have use of a paint booth, stick with the 2-stage paint … If you use a hardener that has not been fully mixed (single-stage paints without a hardener will probably continue to have difficulties), it is usually safer to wait several days to make sure the paint has fully dried. But a spray gun is just like any other tool: It has to be matched to the job you’re doing. Urethane Single Stage (Limco 7) 420 gms/liter (3.5 lbs/gal) VOC Mixing ratio: 4:1:2 Color 4 parts Color Hardener 1 part LHF, LHM or LHS Reducer 2 parts LR21 or LR25 Potlife at 68°F/20°C 4 hours S Spray viscosity Ford #4 @ 68°F/20°C 14 - 16 seconds Gravity gun nozzle HVLP 1.5 - 1.7 mm Spray pressure HVLP at the cap 10 psi OK, so maybe you want a new spray gun but don’t really need one. You should only sand your urethane coat to remove problem areas, such as scratches, ridges, bubbles or other problems that have developed in the paint. DIRECT TO METAL ADHESION. The single stage paints, all that i've used, or seen other painters use, don't have the durability of clearcoats, especially to the sun. Tyler Lacoma has worked as a writer and editor for several years after graduating from George Fox University with a degree in business management and writing/literature. 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