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My car has filler on it as well as original paint. I'm not sure what primers to use on it. Do I need to use different primers for the different surfaces?
Use epoxy primer as your first layer every time for best results.
That being said, you should probably sand a couple of layers off the entire car (at the very least) before getting too carried away. Just pretend it's sandable primer and block the whole car to get everything evened out. Finish sand with primer manufacturer recommendation grit, and then coat with your epoxy. If you're satisfied, paint it. If you need to do any additional filler\glazing\sanding, do that and then coat with a high build primer. Block entire car again. Then shoot it.
If you are doing a Scuff and Shoot you will only need to prime over the filler. You can paint over old paint IF it is stable (not flaking off) and you are not doing a color change. If you are doing a color change you will want to sand the existing paint then cover it with a urethane primer and block sand it out before paint.
These cars are too old to do a blind scuff and squirt. If you really wanted to do a scuff and squirt you need to sand one small spot (dime sized) on each panel down to the base. That means sand a spot on the front and rear bumper, both front fenders, both doors, the hood and the pick a rear quarter panel. Why? because you have no idea how many times the part has been painted. Take my latest project for example, after sanding a spot down on the front bumper I knew I had to take the car to base. You can count the number of times the car has been painted, 5?!
Yes, you could probably make the argument that bumpers get repainted most. My bumper did have the most paint on it then came the driver's side fender and door that had three coats and the rest of the car that had two coats on it. Maybe you just think that its just luck. The rear spoiler that I bought had separately on eBay had at least 5 if not 6 coats of paint!
Use epoxy primer as your first layer every time for best results.
Finish sand with primer manufacturer recommendation grit, and then coat with your epoxy. If you're satisfied, paint it. If you need to do any additional filler\glazing\sanding, do that and then coat with a high build primer. Block entire car again. Then shoot it.
If the OP uses Epoxy primer (and he should) then it's worth noting that if you still have body work to do it is important to spray over it with high build primer, 2K stuff. Body fillers do not bond to Epoxy primers the way they can with 2K primers. The only way that body fillers will bond to epoxy primer is if you scuff the crap out of em. Were talking like 60 grit scratches.
