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Pushing primer over bare filler is fine, and the guys at my old place in Dayton were wrong to act like it was a crime
I sprayed at a collision place near Dayton for six years and the lead painter there would make guys sand filler down to nothing if a single spot of primer touched it. I get why people worry about shrinkage and edge rings, but on small repairs under 8 inches, I always primed right over 180 grit filler and never had a comeback in four years of warranty work. The owner backed me up because our redos stayed low while the other bay was always chasing sand scratch swelling. If you seal it and block it flat, the filler edge disappears the same either way. Anyone else sprayed primer straight over filler long term and seen it fail, or is this just an old habit that keeps getting passed down?
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simons282d ago
How thick are you laying it on those small spots? That matters more than whether it goes over filler at all. On anything under 8 inches you can get away with a lot if you keep the coats tight and give the primer real flash time before you block. Where guys get burned is spraying wet coats over fresh filler that still has solvent in it, then the edge sucks in and you get that ring three months later. I did the same thing you did for years, primed over 180 filler, sealed it, blocked it flat, never had a lift or a shrink line come back on me. The old Dayton rule sounds like it came from the days of lacquer primer and cheap filler that never fully kicked. Your low redo count tells the real story, not the guy with the sanding block.
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