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Another question concerning the use of rustoleum primer. I'm going to use the primer because I have some bodywork to cover up, as well as a lot of rust and a couple different colors of body panels. My question is, do you thin the primer the same as you do the paint?



I would go straight from the can. This will give you a sufficient build of a primer layer so that you can then do a very very light sanding to smooth the primed surface. Smoothest is bestest.. right.

You could go with an 800 or 1200 wet sanding on the primer layer - but be sure to allow the sanded primer layer sufficient time to dry out fully before laying your first coat of paint on it.

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Ahhh. I'm really glad the primer question came up. I've been puzzling over this too, since I have a lot of spot bodywork to do. I don't have any rust -- just some dents and dings.

So, given that, how would you guys rank -- or comment on -- the following options for spot bodywork / primering?

Preparation: Remove paint to bare metal, do metal work and bondo work. Now...

Option 1 : Spray a 2K primer with a Preval sprayer.
Questions: When I read about these products, it's always being discussed by professionals and they always default to 2 steps: First PRIMER then PRIMER/SURFACER. Is this necessary?

Option 2 : Roll on a primer specifically made for rolling such as PPG's or U-POL.
Questions: Sounds great at first, but when you read the literature, it looks like these are primer surfacers. They suggest applying an etch primer to bare steel first. Hmmm. Sounds like 2 steps and 2 different types of primer again... Or -- is my bondo coat the first (DTM) layer so I don't have to worry about this?

Option 3 : Roll on Rustoleum or Interlux primer.
Questions: Wondering it this stuff will work well over the bondo and not just soak in. As well, drying times will be longer (than the catylyzed options above) -- which make it a little more of a pain. Especially concerned about it not being fully dry or not drying properly if it sinks into the bondo which might trap solvents deep down...

Thanks in advance -- Dan.