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CNKS
04-18-2006 17:34:56
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Re: Paint through a Paint Gun and some other quest in reply to Paul In On, 04-17-2006 19:15:30
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Automotive paint guns are for automotive paint, if that is what you mean. You change the needle and tip to adjust for topcoats and primers. The numbers I am giving are a general rule of thumb for gravity feed HVLP, I don't know what the suction feed numbers are. Epoxy about 1.5 mm, topcoat 1.3-1.5, primer surfacers (thick) 1.6-1.8. That said I don't like changing tips, etc, so I run surfacer and epoxy thru a 1.5, no problems as yet. I topcoat with a 1.3. I have a separate gun for primer, rather than risk clogging up my finish gun. Use epoxy on everything, the hardeners used with epoxy do not contain isocyanates, which is the nasty stuff that requires supplied air. BUT read the MSDS of the brand of epoxy you decide to use to make sure. All urethane paints, topcoat and primers, use hardener that contains iso's, thus supplied air is essential, as do all enamel harderers. In other words the hardener for ALL paints except epoxy require supplied air. There are some new paints such as those used in California that may not, I know nothing about those. Iso free hardeners are rumored, but they aren't here yet. Hardener makes the paint flow out better and adds gloss, along with making it more durable and more resistant to gasoline (note that I did not say immune). Hardener also makes the paint cure faster, making it possible to sand out runs, sags, etc, the next day and recoat. Hardeners do not, as some seem to believe, reduce fading.
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