Howdy,
Getting tired of my current two-tone paint scheme (faded 1971 chevelle brown, and rust). I'm leaning toward spraying the whole thing with DP90, and driving it that way for a while. I'm looking to stop the rust from progressing, until I get the time and $$$ together to treat the body right. I have a compressor, so I'll remove the surface rust. Have read the archived posts about epoxy primers, and found them very helpful. My question is:

Can I spray the DP90 over factory paint, or do I need to sand it to bare metal?

This will never be a show car folks -- just hope to have a decent daily driver someday.

Obviously, it'd be easier to just scuff up what's already there with a DA sander, if that would produce acceptable results. (Grit recommendation?) Anything else to be aware of?

Many thanks,
mark.

PS -- Useful trivia: Krylon Rusty Metal Primer is a pretty good match for 1971 Chevelle Brown. Got me through the winter, anyway...

We'd like to see that 71 in a nice coat of color, but....if you want to just put primer on it, well, I guess......

DA the rust down as much as possible. remove the rust mechanically. ALL of it! Don't use phospho or any rust converters. Buy an etching solution and use it on the bare metal. Da sand the painted surfaces with 320. Clean the surface with a wax, grease, silicone remover (actually before you start sanding also).
Now, here's the cool part. Martin Senour Paints, carried by your local NAPA store can mix a urethane primer in any shade you want. Red, yellow, orange blue, brown, whatever. At least you can have some color to it besides grey. Two or three good coats should do it.

Jimmy P -- Thanx for the reply. Glad to see I can just scuff the paint and prime. Will be MUCH easier than sanding to bare metal, or using a different product over the paint than over the bare spots.

I hope to shoot it in color someday, but for now I'll settle with keeping it on the road. If I don't get the mechanicals sorted out first, I won't be able to keep driving it... I just want to keep it from deteriorating until I can do the body work right. And I've got to come up with a lot of cash and a lot of knowledge between now and then -- I've never done body work or welding before.

Custom primer colors? Lordy. I'll have to think about that. For now, I'm leaning toward the DP90 (black). Never did understand why they started painting them any other color...

Cheers,
mark.