Sanding Primer Coats

If the bubbles are on a smooth surface you can probably sand back down to bare plastic and respray that area. If there are door or panel lines, I'd strip it off that area. Castrol Super Clean, a toothbrush, and a few minutes will take care of it. Since it's just a primer coat, your finish coats will cover up any minor differences in the shades if there are any.

Sounds like grease under the paint... happens to the best of us. I would suggest completly stripping that area and cleaning it, give it a very light resanding and reapint. that shoudl take care of it for you.

Can you sand finish coats and reapply another coat? I sprayed a Corvair tonight with a spray paint can and it developed bubbles along the sides of the car, I think I sprayed too much. I'd like the car to look good obviously, but now it just looks like a freakish car model with chicken pox.

Unless you still have seam work to do after priming, a light sanding is all that's needed. All you want to do is smooth the prime coat, not remove it. I use very fine grit Micro-Mesh pads for sanding primer. Don't forget to clean the model after sanding & before any additional painting.

Regards, Rick