Rust removal, how far????

rjsjea said

Sandblast it......I'm of the minority judging from the posts above, but rust will always be there if you dont remove it. I wouldn't risk it coming back after you spend $1,000's on paint and bodywork. Epoxy primer or etch primer will adhere better to clean metal. That's for the exterior of the car, the underside is much more forgiving

If you're working on your plumbing truck or firewood hauler, prime right over it.

Click to expand...

Yup. If you don't take care of it now, it will always be there. Oxidation will continue and you'll have little bubbles in your paint popping through in a year or so. Blast it clean, DA it with something on the par of 80 grit, then etch it. Etching blasted metal without "smoothing" it out just causes more rust. Epoxy primer or urethane prime afterwards as you see fit.

Personally, I moved away from epoxy a long time ago. Not doing any promoting for one specific brand, but when PPG's NCP 271 and 272 hit the market I gave up on epoxies. NCP is a urethane surfacer meant to be sprayed directly over bare. It kills two birds with one stone. Fills in any imperfections in the bare, like 80 grit DA scratches, and gives a rust hold out on bare metal. But if you like epoxy go with it.