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spots in an enamel paint job

About 10 years ago I used DAR Acrylic Enamel by PPG on my bike and it turned out great. This evening my son and I painted a new fender panel on his Sebring with it and it showed promise, but had some really nasty dimpled spots over most of the area. I had him clean the new panel with paint thinner before we started, but I did not watch how he cleaned it. It does not look like the old fashioned "fisheye" because it is a single dimple, not the ring with a dimple.

  • Are the spots caused by incomplete cleaning, water in the line or what? As I said, we used paint thinner. Should we have used another cleaner? Should there have been a more thorough cleaning job?
  • Can we use 360 or 400 sandpaper to level the paint and then apply another coat. Or would it be better to sand down and rub out.
  • Is there a maximum time limit to put down additional coats?
Reply to
eganders
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Paint thinner isn't even *close* to being an adequate pre-paint cleaning fluid. It leaves an oily residue that will interfere with paint adhesion and cause dimples.

Reply to
Daniel J. Stern

If you didn't prime your wasting your time. Paint doesen't stick to anything worth shit except for primer. To do it right most people blast with walnut shells, then metal prep, then an acid-etching primer. However you can do quickie jobs just by wet sanding the existing paint to roughen it up, prime over that, then paint. Of course the paint will probably peel off in a few years but you will probably sell the car by then.

There's tons of links out there, Google is your friend.

Ted

Reply to
Ted Mittelstaedt

also use windex as a final wipe down after the lacquer thinner and before paint.

nate

Reply to
Nate Nagel

PPG should offer a cleaner to use immediately prior to painting. Just forget the cost--it's cheap when it saves a re-do! If the paint is a non-metallic color, you can use 400 to wet-sand and then buff out, POSSIBLY to your satisfaction. If it was metallic, AND you sprayed clear on top, you can do the same thing. If it is metallic and NO clear was used, or in any case, you can sand it and apply coats on top. ENSURE sanding gets all the dimples, eyes, spots(whatever we call them) completely flat in any case. Too much time should not be a factor. A minimum time of several days of drying should be sufficient for acrylic enamel. HTH & good luck. s

Reply to
sdlomi2

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