Quote:
Originally posted by j.collins
Sorry, to hear of misfortune, the problem you are describing is typically the result of solvent evaporation, when a car is being prepped and painted right ,various stages take place,- removel of original bad paint, rust removal/conversion, filler application, spot putty, priming, sanding, more priming, and finally topcoating.In todays fast paced business world typically all of these steps are performed back to back,with little or no time in between, resulting in the solvent used to thin the primer and solvents in the other chemicals becoming trapped underneath the finish film of the topcoat, then attempting to evaporate and becoming trapped as a gas/air bubble. this fast pace can cause other issues as well, body filler is a polymer which upon cure, will shrink appx 2-4%, if it is primed and finish sanded before a 36 - 72 hour period, you could end up with "sand scratches", minute lines or scratches under your final paint coat.
Unfortunately, you have no easy way out, the bubbled panels need to be taken back down to the filler, re- spot puttied ,wait , prime, wait, sand, and top coat.
Some guys will tell you ,these issues are not an issue anymore due to the advent of catalized 2 part products in current use, but be assured if you follow my advice you will get a better finish every time.
Been laying down color for 30 years, Joe
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Thanks Joe for the great information.
BTW, thanks for the insight into the "sand scratches" because I have them too on the fenders that were painted along with other defects.
I was afraid that there was no easy solution to fix the problem short of just starting over.
It was an expensive learning experience.
nine_one_4:
Thanks for the pointer, I'll consider that in light of this new information.
I'll have to dig up some expert witnesses.
Thanks again.