Reply by pintodeluxe

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Posted on HVLP Help

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6175 posts in 3617 days

#1 posted 01-03-2018 04:18 PM

Spray indoors where you can control the temperature, humidity, as well as keep bugs and leaves out. Use fans for ventilation. Often you can heat a work space for a few hours prior to spraying, then run fans and partially open a garage door for fresh air.

Yes you need to clean out the gun after each coat. I clean my gravity feed HVLP conversion gun after each coat when spraying lacquer or shellac. I don’t like poly. Sometimes you can get away with spraying without cleaning, but it’s a gamble. Every third time you do it, it won’t spray right. That’s why I clean my guns after every coat (it takes 2 minutes to disassemble the gun and soak it in re-usable thinner).

I don’t need to cover anything in my shop to spray lacquer or shellac. You may with poly (oil based poly for sure yes).

Lay the components flat on a temporary work surface. A couple pieces of 1/2” plywood on sawhorses work great. Vertical pieces have the potential to run or sag, but the finish will lay down best if the parts are horizontal. Lay a part flat down on your work surface and spray the back side (no edges yet). Then put out some painters pyramids (or wood blocks with drywall screws sticking up) and flip the piece right side up. Then hit the edges, and finish with the field.

Painters pyramids can dent large or heavy workpieces. It’s a problem even with dense hardwoods. That’s why I never put project pieces on pyramids to spray the back side. Set directly on your temporary work surface for spraying the back side.

Spray sample boards to get the feel for the gun before you spray your project.

Good luck!

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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