This post comes in response to to a readers question. Donald Butler from Houston is restoring a Jeep and keeps a video blog of his progress.
Donald asked what is the best gun for doing a metallic finish for a base coat clear coat paint job?
In an ideal world I would like a whole arsenal of guns. I would like a 1.4 HVLP gun for base coat and a 1.3 RP (reduced pressure non hvlp for the clear), a 1.8 for urethane primer a 2.2 for those times when I need to use a polyester primer and a detail gun for shooting smaller projects and doorjambs.
The 1.4 HVLP gives the best color match and the 1.3(or smaller) RP lays down the clear the best. Primer guns need a larger oriface to lay down the heavier material.
Alas I can't afford all of them. I get by with a 1.4 HVLP for both base and clear a 1.0 detail gun and a 1.8 primer gun
There have been manufactures over the years that have made guns with interchangable air caps and I've tried a couple and have never been very impressed. They are compromises and just don't seem to work out well. To do it right youo would have ot change out the air cap, fluid nozzle and needle. Doing that you've probubly spent enough money to buy a new gun.
By far the most important thing is to match your gun to your compressor. This is about air consumption. Guns need a critical volume of air to operate correctly if you spend a lot of money on a good gun that requires 13CFM (cubic feet per minute) to operate and your compressor can only deliver 8 CFM it will not operate correctly and you will be disappointed.
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