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Old 04-09-2005, 04:44 PM
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New paint bubbling

We painted this truck in July. It has seen very little outdoor weather since then. I keep it in my garage most of the time. Now I have noticed this paint problem in several areas. What caused it and how can I fix it now?
I wiped the truck down carefully before painting with the degreaser/cleaner from the paint store.
It's single stage uerethane.
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Old 04-09-2005, 04:47 PM
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Bummer. That is from not having a clean surface and the contaminants prevented the paint from sticking. About all you can do si strip off the new paint and start again with a cleaner surface. Chock it up to an investment in your education!
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Old 04-09-2005, 04:51 PM
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I'm extremely sure the surface was clean. I went to great detail cleaning it right before we sprayed. Can I pop the bubbles or something????anything??
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Old 04-09-2005, 04:55 PM
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How else was it prepped? Did you have it down to bare metal or did you shoot over existing paint. If you shot over existing, did you sand it or scuff it before shooting? Also, what primer/sealer did you use?

I'm no painting expert but it would appear to me, assuming it was cleaned as you say it was, the paint is not "gripping" which could be due to inadequate scuffing of the undercoat or mis-matched primer. Whatever the cause, I think the "fix" is to sand it off and start over (not something you really want to hear at this point I'm sure). There are some much better paint experts on the the board who will hopefully have a better diagnosis.
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Old 04-09-2005, 05:03 PM
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I did sand it well, just not down to the metal everywhere. I used K36 primer, no sealer. I used rattle can etching primer where the bare metal was showing through.
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Old 04-09-2005, 05:23 PM
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Well . . . it sure appears your truck doesn't agree that you cleaned it well enough! Did you sand all over w/ 320 then wash down w/ wax & grease remover? Sure looks like localized contamination to me.
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Old 04-09-2005, 05:53 PM
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A bubble that big eliminates a lot of things.
As soon as you cut that bubble off with a razor you will know what caused it.

Here are the potential culprits on a bubble that size:

Pinhole through the metal (Rust).
Piling of lacquer primer. (aerosol)
Spraying of K36 over lacquer primer.(melted it)
Water in line when shot primer or paint. (most likely in primer)
Just thought of something else, premiering over a spot of filler or glazing putty to soon. (gassing)

I can't think of anything Else that would cause a bubble like that but like I say when you pop it, it will have a story to tell.

Last edited by BarryK; 04-09-2005 at 06:04 PM.
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Old 04-09-2005, 06:00 PM
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Hmmmmm. We did have some kind of a device to filter the water. My Dad bought a brand new Devilbis gun with the filter just to paint this thing.
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Old 04-09-2005, 07:02 PM
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Ive seen urathane primer bubble like that if its applyed to heavy over uncured bondo or laquer. Did you prime over that rattle can stuff?
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Old 04-09-2005, 08:31 PM
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Seems like we did prime it after bodywork with no long period of time in between. I didn't realize you had to let body filler cure. I know it was at least several hours between. It took forever to clean his spray booth before we could move the truck in. (It's a cabinet shop)
I think we primed after all the rattle can was sprayed (which wasn't much)
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Old 04-09-2005, 08:41 PM
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I'm going with either residual pre cleaner solvent left or absorbed and has not evaporated or moisture from the line. Depending on what cleaner you used,they take some time to fully evaporate,especially if you use over a primer,aka sponge.
Regardless WHAT gun you use, NONE will prevent moisture from entering.
Even with a pre filter screwed to the gun inlet,you can get moisture in the paint.
Outside chance of that enamel rattel can primer solvent still trapped.
WHY do we preach the EVIL'S of rattle can's??????
You may have experienced it first hand.
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Old 04-09-2005, 09:37 PM
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I need to remind you guys of the incredibly small amount of the etching primer I used. (rattle can)
It was in a very few places and they where small. I don't think any of the bubbles where in the rattle can areas.

One important clue I mentioned in the 1st post. The truck was painted in July. The bubbles are very recent. I'm thinking they are moisture related. There is a lot of body filler on the back sides around the fenders where the bubbles are popping up. (do to the lack of replacement panels for this vehicle).Could moisture be getting into the filler from the back?
Thanks again for the help.
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Old 04-09-2005, 11:35 PM
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Quote:
Originally Posted by garretthes
Seems like we did prime it after bodywork with no long period of time in between. I didn't realize you had to let body filler cure. I know it was at least several hours between. It took forever to clean his spray booth before we could move the truck in. (It's a cabinet shop)
I think we primed after all the rattle can was sprayed (which wasn't much)

I had always waited at least a day after laying down filler befor painting, becouse of feer of escaping solvents after sanding filler........If you notice, after sanding it, it will still give off a noticable odor, and thats escaping solvents....

Maybe spraying only hours after body work, could have something todo with the problem, but then again, i'm sure body shops do it all the time?
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Old 04-10-2005, 06:30 AM
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had the same problem, I found out the hard way, wax and grease remover should be dryed off with a rag, do small secions at a time, second mistake not using a sealer, hope this helps. doc
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Old 04-10-2005, 11:46 AM
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So here is what I have learned:

Dry the degreaser/cleaner with a cloth.

Use a sealer

Water is bad

Avoid rattlecans (I'm still not convinced this was a contributor but ist's good advice)

What did I miss?

Oh yeah, hire a professional.
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