![]() ![]() Paint Sprayers Painter working with a paint sprayer and aiming to prevent blotchy spray paint. ![]() Let’s answer the question of the day and show you how to fix blotchy spray paint. There are a few different causes for each of these problems, but they tend to happen together and share most of their common causes. These can be fish eye, bubbling, or pools. Those are the classic trails, dots, and drips that come with rough spray paint work.īlotchy spray paint also usually appears with a few other spray paint problems. You’ll also be able to see the iconic spray paint marks all over the piece that’s been painted. There are patches of darker color mixed with patches of lighter color. When spray-painted coatings become uneven, are painted in the wrong conditions, or with low-quality sprayers, the paint job can look blotchy.īlotchy spray paint jobs look uneven. Spray painting takes a bit more skill than painting with a conventional brush. I personally love INSL-X primers for all my furniture and cabinet projects. Be sure to choose a primer compatible with the type of surface you’re painting and follow the instructions carefully. ![]() The primer will help to create a more even surface for the paint to adhere to, resulting in a smoother, more uniform finish. This step is often forgotten or ignored, but it is drastically essential for a smooth & even finish. To prevent this, use a primer before applying the spray paint. Use a Primerīlotchy spray paint can sometimes be caused by uneven absorption of the paint onto the surface. Once the surface is smooth, clean it thoroughly and apply a new coat of spray paint (ideally with the comfort grip above. Be careful because you don’t want your sanding marks to show through to the top coat (that’s what I use extra fine). Start by using an extra fine-grit sanding sponge to gently sand the surface. If the blotches are more significant, you may need to sand down the affected area and apply a new coat of spray paint. The trigger handle not only makes spraying more comfortable but it allows for more precise and controlled spraying. I personally love the Rust-Oleum Comfort Grip. The best solution to blotchy spray paint is to not have blotchy spray paint. If brushing that doesn't work too well since the contact of the brush tends to disrupt the original application.3 Quick Fixes for Blotchy Spray Paint Spray Under Control If you are spraying the paint, I find that you can apply two "coats" in one "application" which helps with the coverage and has only one dry cycle. If post baking after the solvents have flashed off, I sometimes go up to 200F if I'm in a hurry. Too hot and the solvents will boil and the finish will be ugly. How hot? I generally go for just hot enough to be uncomfortable to touch. It also helps to avoid sags in the paint. Warming the part before applying the enamel seems to help too. Round numbers, a chemical reaction's rate doubles for every 18 fahrenheit degrees so you don't have to make it a lot warmer to see a big benefit in cure time. I have had good luck adding some japan dryer to the paint to catalyze the cure and, if possible, heating the part in an oven or with a heater fan or something to warm up the part. So, you can probably apply multiple coats within the one hour window over and over, but the resulting film will take a long time to harden. It will skin over where the top layer of paint is exposed to air, but the rest of the material in the can will not harden up for weeks, months or ever (for practical purposes). You can see this if you leave a can of enamel open for a long time. The thicker the paint film, the longer the cure time since the thick film inhibits the availability of air to the lower layers of paint. ![]() Unlike lacquer type finishes which dry through the evaporation of a solvent, enamels will not re-disolve in their own solvent once they are cured which, as pointed out above, can take a long time. Enamel cures via a chemical reaction between air and the drying oils in the paint. ![]()
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