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Old 07-08-2006, 04:30 PM
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any link btwn undercoating causing blistering in paint?

a guy at py forums says he sprayed undercoating on a seam and he noticed paint blisters that look like rust blisters on his paint. he says in the last 13 years the blisters haven't gotten any bigger.

anybody else have any similar experiences with undercoating? the blisters in my paint are over a rusted area that was painted over, that's why i think i have blisters. but it did spray undercoating right on the other side of the quarter panel where my rust blisters appeared. could they have been more or less, "helped" by the undercoating? it's pretty pungent stuff.

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Old 07-08-2006, 07:14 PM
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My opinion, I think a poor rust repair was the cause, not spraying undercoating on the other side of the panel. Most undercoating I've seen says you can paint over it. Now if rust was not taken care of and undercoating was just shot over the rust, the undercoating may slow down, but rust would probably eventually start coming through the undercoat. Lets hear others opinions on this, but I doubt it was the cause of your blisters.
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Old 07-08-2006, 09:49 PM
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Ken is right... rust never dies.. if someone plans on leaving behind a chewed on panel.. it needs to be blasted to clean out the pits and then epoxied to seal up the metal.. then you can fill the area and move on, however you still dont know what is behind the panel and it also needs to be sealed if possible...

You can stop rust on one side all the while it is still eating away at the other side... It is always best to replace... and when they dont make the panel , you look for doaners or someone who can do good fab work...

I have been grinding lots of POR 15 out of this car I am doing right now... It may have been fine, but I feel much better knowing what is under my paint... then only I can be blamed...
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