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My old painter in Dayton told me to quit wet sanding primer with 400 grit and he was dead right
He ran the paint booth there for 18 years. I argued with him for a week about it, kept saying 400 knocks it down flat and it saves me time. Then I did a fender on a Civic with 400 wet and the sealer shrunk back about a month later, every scratch showed up like a roadmap. He didn't even say I told you so, just handed me a sheet of 600 and said try this on the next one. Been using 600 on primer ever since and no comebacks. What grit are you guys running on your primer passes?
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wilson.claire17h ago
Sat through a guy's demo at a swap meet years back where he had two doors side by side, one wet sanded with 400 and one with 600, then shot both with the same sealer. The 400 door looked fine going out the door but he brought it back six weeks later and you could read the sand scratches from across the shop. Guess what got me was he said the grit number hardly matters if you let the primer cure too fast under heat lamps. He was spraying in a cold booth with no forced air and still got shrinkage, so it was more about how thin he laid the sealer than the paper. Stuck with me because I always blamed the grit and never once thought about my flash times. Still run 600 on anything I care about though, that part of your painter's advice holds up.
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