Paint bubbled months later-how to prevent??

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challenger57

cuda57
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Last year I repainted my truck bed, it had minor dings so I sanded bare the areas and did the putty work. Several months later at some of those areas the paint bubbled. I am soon getting ready to paint my project car that also had some minor dings. I have too much time and money in this car for the paint to bubble later. What should I do in my prep to prevent this. The car was mostly stripped down to bare by sanding, no solvent. I have not primered it yet and will be using a filler primer. My truck was done the same way but not striped. The project car will get a base coat of silver metalic and top coat is House of Kolor tangelo orange pearl. Any help appriciated. Mark
 
Could be a lot of things, rust specks from sitting, filler not mixed properly, water in paint or primer, some sort of contamination of the paint process. What is lifting? The paint, primer, filler, or under? You have to investigate the problem to find the cure.
 
As per PurpleHaze, Etching-primer is a must. "Whats dat?" Etching-Primer is slightly acidic so it will etch itself to the bare metal. Otherwise, your primer,paint or whatever wont adhere properly and you'll blow it off at the car wash. Spend the $ on material, take your time and good luck. Oh yeah, move. Painting is so much easier at 78 degrees (82 yesterday)
 
Yup Epoxy or Etch is the way to go over bare metal. Remember to wipe it down with wax and grease remover a couple time before you spray.
 
Was the car allowed to sit outside in primer while it was raining?

Was the body filler exposed to rain?

Do you have a good water filtration system on your compressor?

Did you wipe down your body filler with wax and grease remover?



All of the above can cause problems.


I'm betting water was allowed to enter the process.
 
A good final wash, get it from local auto paint store. If you are spraying water, you will see it as you spray. Really need a god sealer.
 
So many questions, rust was never an issue, just minor dents and dings. I have a good water seperator in my line that I clean out good before I start any spraying. think I used a urethan primer, I will have to check when I get home. I do know it was not an etching primer. I also did do a pre wash wipe down before primer was applied. I let it dry for about half an hour so no fumes were around and the putty was dry, I only lightly wiped the putty areas so that it did not soak in. The truck bed never left the garage once I started the job, it was on saw horses. I hate to remove the bubbles to see what under them but I know it is not water, I poked a pin hole in one. Will the opoxy or etching primer have a bad effect on putty?
 
definitly sounds like moisture in the primer if it only did it over the bare metal you need some kinda dessicant dryer to take care of moisture ..i have been doing body work for a living for 17 years have run into this problem before...
 
Evan Pratt said:
Yup Epoxy or Etch is the way to go over bare metal. Remember to wipe it down with wax and grease remover a couple time before you spray.
Click to expand...

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use something to clean before you paint before you primer before you put on filler. degrease it or it will not stick as well.

you can even use rubbing alcohol if you dont want to buy body shop solvent

everything sticks better without grease (even fingerprints have a bit of oils in them)

http://www.eastwood.com/pre-painting-prep-12-cans-cs.html
 
Good prep-solvent for the final wipe is nearly 60 bucks a gallon now.....!!!!!!!!!! But it's worth it. If adhesion is the problem, 2K epoxy primer (like the guys have said) and a final wipe with a good prep-solvent will be the ticket to peace of mind.
 
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