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Bill Tindall, E.Tn.
Variables that affect film thickness: the material sprayed , its dilution, gun fan spread, gun feed rate adjustment, gun sweep velocity, target distance, overlap, air pressure. I vary all these variables for a typical piece of furniture. I will close down the fan for legs and open for spraying the top, necessitating feed adjustment, as an example of varying spraying conditions during spraying a piece.
What works for me is to spray in good light and look for a full wet coat, but not so wet as to get a run. If with the first pass I don't see full wet coverage I adjust some of the above variables to achieve a full wet coverage. If I see a thin area I will spray over it to get sufficient coverage. I'll diddle with the dilution solvent to slow evaporation if the wet coat is drying too fast to level or allow a quick second pass to add coverage.
Clearly one time measuring a partially evaporated film thickness on a test piece will provide no guidance for spraying my furniture. What I will do is spray some test surface to get a feel for feed rate. The test surface could be a saw horse leg, or piece of cardboard.
It is not rocket science. My daughter and granddaughter spray easy to spray pieces successfully, fist time. I tell them to spray a wet coat, they do, and success.
*NM* -- Hank Knight -- Saturday, 16 April 2022, at 3:49 p.m.
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