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I have a question for the satin/flat roller's out there!
Our journeyman was given the task to try this on his project. He is rolling flat black rustoleum. he is on the 5th or 6th coat and it still has really bad roller marks.
I went over it as I have been playing with the method for a while, and I had no better success. it goes on easy, but then when it dries it looks bad.
I am thinking for flat we may need to shoot it.



Maybe there's a difference in the satin vs. flat in the way it comes out. I'm sure you saw the 69 Mustang that looks really cool in satin a few pages back...other than that maybe your friend wasn't sanding every other coat. If not then the roller marks from previous coats will just multiply with each layer.

I found that on a test panel where I tried both ways. Saving a few coats to wet sand only the last one did not look nearly as good as the other half where I followed the original method everyone here goes by.

I'm guessing that is not the case and it could be that flat is just tougher to get right compared to the gloss and satin colors.




One thing about sanding flat paint is that if you sand with a coarse paper, you'll get scratches. Which you sand out with progressively fine paper, which also gives you the shine.
With flat paint, you don't want that shine, and I don't know of any other way of flattening an imperfect finish without 'polishing', nor restoring a flat finish after it's been rubbed away.

I sprayed mine with flat paint, and although I wetsanded every intermediate coat, the topcoat had to be very carefully applied because I knew I couldn't sand anything out of it!