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Paint Blister/Bubbles???

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New User

May 12, 2012, 3:57 PM

Post #1 of 8 (6182 views)
Paint Blister/Bubbles??? Sign In

I’m writing with the hope that you might be able to offer this novice painter a cause and possible solution to a problem I recently experienced.

I have a 2000 Jeep Wrangler, which had severe rust around the window frame (see photo). The paint and rust was wire wheeled and ground using an 80 grit flap disc to clean metal as far as the eye could see. The rusted area was repaired using USC all-metal filler. The filler was then sanded to shape.

Having a limited budget and no access to a compressor or spray equipment I decided to use aerosol touch-up products manufactured by

The area was cleaned using a tack rag and prep-sol 3919 and primed per the manufactures directions using their Aerosol Red Sandable Acrylic Lacquer Primer, it was then base coated and clear coated per the manufactures instructions. The paint was allowed to cure for approximately one week before wet sanding with 1500 grit wet dry. I then compounded using Meguiars Mirror Glaze #105 Ultra-Cut Compound, followed by Maguires Mirror Glaze #205 Ultra Finishing Polish. It turned out very well considering this was my first attempt at auto painting and I was very pleased.

However after several weeks I noticed some spots were the paint appeared to be bubbling or blistering. I have attached several photos of these areas.

I would appreciate any help as to what may have caused this problem and what the best method would be to correct it.

Thanks to all


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 12, 2012, 4:06 PM

Post #2 of 8 (6173 views)
Re: Paint Blister/Bubbles??? Sign In

Looks like you should have used a sealer. The paint appears to be reacting to something in the base coat.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Ultimate Carjunky / Moderator
Discretesignals profile image

May 12, 2012, 5:02 PM

Post #3 of 8 (6135 views)
Re: Paint Blister/Bubbles??? Sign In

Have you contacted the manufacture that makes the paint kit?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

New User

May 12, 2012, 5:28 PM

Post #4 of 8 (6122 views)
Re: Paint Blister/Bubbles??? Sign In

I did try to contact the manufacturer several times via email and phone but apparently its difficult when they know it a paint problem. In any case I did eventually talk to a rep who at first said it was the compound and polish I used because he said they contained wax, when I emailed him the MSDS pointing out that there were no waxes used in the product he then said he would have to get back to me. A week went by and I finally got to speak with him after repeated phone calls.He then said that it was the rust that was causing the problem but could not explain why when asked. He did say that I should have used and acid wash prior to painting, but didn't explain why when asked. Now the thing I don't understand about his comment is, the rusted area was ground down to what I preserved as clean bare metal, to which several layers of USC All-Metal was applied and sanded to bring back the original contours of the window frame, if it were the rust that was causing the problem why would only the pant blister and not the All-Metal???

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 12, 2012, 6:42 PM

Post #5 of 8 (6110 views)
Re: Paint Blister/Bubbles??? Sign In

I don't know but from looks of this it still has pin head rust that is still growing under the paint - maybe. It may have looked all ground off but that looked nasty.

From a rust belt so deal with it a lot. It's alive and grows and pretty much only replacing parts that rusted is going to work for long but would have expected longer that indicated.

It could be some reaction but would think that would happen right away. Not an auto body tech but will fix some real junker so no holes and don't care about the looks by then.

See what this rep says with the pics,


Larry T

Aug 23, 2012, 4:03 PM

Post #6 of 8 (5940 views)
Re: Paint Blister/Bubbles??? Sign In

Rust is like tooth decay. You must first get rid of all the decay. While you think you have done the job, you probably haven't. Even if you do get rid of the immediate decay, there are areas near the rust that are probably so thin that it will break thru soon. Usually, to rid the problem, one must replace the affected area completely. In your case, I would just put up with it.

I am anovice on this forum, but have vast experience in body work. Take my word for it.

Veteran / Moderator
nickwarner profile image

Aug 23, 2012, 4:14 PM

Post #7 of 8 (5936 views)
Re: Paint Blister/Bubbles??? Sign In

Welcome to the forum Larry. Its good to hear from an experienced bodyman and I'm sure we will get people who will benefit greatly from your assistance in here. Please look at the dates before posting a reply. Generally if a thread hasn't been active for a few weeks we leave it be, as the original poster would've either solved his problem or posted back to his post by then. When you post to a thread, a notification email is sent to anyone else who has ever posted to it and for some that can get annoying. We have people drag up stuff from years ago sometimes. For those of us here who are regulars it fills up an inbox fast. Please keep that in mind and again, welcome to the forum.

Larry T

Aug 23, 2012, 4:27 PM

Post #8 of 8 (5929 views)
Re: Paint Blister/Bubbles??? Sign In

Sorry Nick. I didn't look at the date. It's just that people think they can simply sand off a little rust and everything will be fine. In reality, I think I posted a helpful suggestion to new viewers that might happen to pull this one up.

By the way, I haven't practiced auto bodywork for many years, but rust is still the same!

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