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Bubbles in paint finish

Bob Member

I need help! I painted gables and it is showing so many bubbles on the board. I painted all job and everything is fine except this one. I drained all the condensation water from the system and it is still showing burst bubbles. I am using 2 component plasticolor. Any idea what is making that burst bubble finish?

View higher quality, full size image (3264 X 2448)

2/16/16       #2: Bubbles in paint finish ...
Leo G

Looks like Fisheye to me. Maybe come contamination on the board itself.

2/17/16       #3: Bubbles in paint finish ...
Paul Snyder  Member


Bob - the picture only shows craters. Here's a few questions to help narrow the cause;

  • Did the craters start out as bubbles that popped?
  • Did the craters appear as you were spraying or did you get bubbles as the piece started to dry?
  • Did you sand the finish level and re-coat? if so, did the craters appear in the same spots?
  • Is this one substrate different than all the rest?
  • Did you spray this piece a little differently than the others? Or mix a new batch of finish?
  • Was this piece in the sun before or after you sprayed it?
2/17/16       #4: Bubbles in paint finish ...

it started when I was spraying. I did send it before spraying.

2/17/16       #5: Bubbles in paint finish ...
Paul Snyder  Member


Bob - I posted a few questions that will help define the likely cause of the problem but if you don't answer them the replies you get will be guesses. Do you want a good answer or some guesses?

2/22/16       #6: Bubbles in paint finish ...

That is fish eye.. all day long.

2/22/16       #7: Bubbles in paint finish ...
Paul Snyder  Member


Or it could be solvent pop, air entrapment, or substrate gassing. The article at the link below covers some of the basics....

Surface Defects - symptoms and causes

2/22/16       #8: Bubbles in paint finish ...
Paul Snyder  Member


What caused this? See the link below for the answer.

View higher quality, full size image (800 X 560)

Craters in the paint

2/22/16       #9: Bubbles in paint finish ...

I agree paul it could go either way but Bob did say it was immediate... which rules more to contamination when it crawling right off the gun..... solvent pop for me seems to happen as the panel starts flashing off... fish eye starts crawling as soon as the first pass is laid down..... either way neither is fun to fix

2/22/16       #10: Bubbles in paint finish ...
Paul Snyder  Member


Shane - I was hoping Bob would provide more information by answering the questions. He used the word bubbles in his first post which made me think it might be solvent pop, air entrapment, off-gassing, or even condensation in the air line (even after draining the separator). The picture shows the final result, but not the sequence of events that got us there.

Without more information, fish eye is a viable guess.

2/22/16       #11: Bubbles in paint finish ...

I fix by cleaning with methanol and spray dust coat , wait for 15 min - spray wet coat . Looks good now.
Thanks for response

2/23/16       #12: Bubbles in paint finish ...
Paul Snyder  Member


Bob - glad you were able to fix the problem.

Still curious what caused the problem.... When it first appeared, did you have bubbles in the paint that popped?

2/23/16       #13: Bubbles in paint finish ...

i'm Still not sure why this happen.
No its not bubbles looks like small craters.

I will start to use new color today and see if problem in paint or contamination in air supply.

2/23/16       #14: Bubbles in paint finish ...
Robert Member

These were craters from the get go. Had they been bubbles you would have seen a ring at the very top of the crater. That ring would have been the result of the coating collapsing onto the crater. No bubble.

The craters were a result of some kind of contamination that didn't get along with the coating.

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