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It depends on the pot life of the primer and paint whether you can mix one batch or two, but if I have to wait 10-15 minutes between primer or paint coats, I leave it in the gun..... If I have to wait longer but still within the pot life time, I will dump the paintgun contents back into my mixing cup and dump a gurgle of appropriate thinner in the gun and squit some through it..... When I am redy to spray again an hour later, I will test spray the thinner, then dump it and refill with the paint or primer giving it a test squirt to get the remaining thinner out and to insure the paint is spraying nicely. Of course if the time frame between spraying is over a few hours, I will thoroughly clean the gun with thinner between spray sessions.
This is assuming you are you two part urethanes or two part epoxy primers.... With old school lacquer primer, you can let it sit longer in the gun (especially if you are using an old "primer" gun.
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Last edited by Tim Hancock; 07-11-2011 at 06:05 PM..
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