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(Post Link) post #1 of 5 Old 13-08-13 Thread Starter
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New Paint Cracking

Hi all.

Wondering if anyone has come across this issue before and can offer any advice.


Unfortunately I had a bump in my beloved GT in December last year.

Since then I've had an on going saga with the repairs, eventually my insurance agreed to let me nominate my own repairer to put the shoddy work right. At the same time I agreed a cash deal to respray my rear bumper (not part of accident)The damage on the rear bumper was merely stress fractures in the paint. The plastic wasn't split, or cracked.

After it was first resprayed a crack appeared within a week. The crack had jagged edges and was only paint deep. The body shop took it back in to redo the work. They pointed out that there was no crack in the plastic, but had no idea why this had happened to the paint. After they repaired it again, all looked good, until a couple of weeks later. The same problem again. same area of the bumper but not exactly the same place. Again the body shop agreed to put it right and booked me in for a the following week. When I dropped the car off I pointed out that the crack had got wider, I was able to get my finger nail into it. Still no closer to finding a reason but they stripped the bumper back to plastic, inspected it, found no cracks and did another respray. 3 weeks down the line cracks have appeared again. Same area again but not exactly the same place.

The body shop have now refused to fix it. They have said the bumper must be faulty, they will not attempt to fix it again, as they say its obviously going to keep happening.
I understand their point, it's costing them time and money each time they redo it, with no end in sight.

Eventually they agreed that if I were to buy a new rear bumper (at my cost) they would spray it. However I can't spare the cash to buy a bumper (car is in for full cam belt service tomorrow) nor do I see why I should. As I can't see how this could be a fault with the bumper.

Has anyone got any idea what may be causing this?

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I.ve seen this before I think it's something to do with silicone getting into the paint or the primer apparently it's present in some polishing products and can be a real ***** to remove if the panel isn't prepped/degreased properly....
Hopefully someone with more bodywork experience will be along shortly........ My humble opinion would be to take the whole panel back to bare plastic then prime it then rub down and degrease then repaint.....I think your problem is maybe because they are just keying the good paint on your bumper rather than removing it and it is this paint that is impregnated with silicone which is then bleeding back through ...
Hope this helps.
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(Post Link) post #3 of 5 Old 14-08-13 Thread Starter
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Quote:
Originally Posted by Jcm5659 View Post
I.ve seen this before I think it's something to do with silicone getting into the paint or the primer apparently it's present in some polishing products and can be a real ***** to remove if the panel isn't prepped/degreased properly....
Hopefully someone with more bodywork experience will be along shortly........ My humble opinion would be to take the whole panel back to bare plastic then prime it then rub down and degrease then repaint.....I think your problem is maybe because they are just keying the good paint on your bumper rather than removing it and it is this paint that is impregnated with silicone which is then bleeding back through ...
Hope this helps.
Thanks, this gives me a good starting point to go back to them!

They have promised me that it has been taken back to bare plastic. But I only have their word on this. Seems to be a real issue within the trade that there is no choice but to take people for their word.

Can anyone add anything more to this theory. I would like to go back to them with as strong a case as possible that it is their fault this keeps happening.

Thanks.

Last edited by Mr Flibble; 15-08-13 at 10:35.
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If you can lift the paint off with your fingernail then it has virtually no adhesion. Silicone contamination, as suggested above, could be responsible and it is difficult to remove: many solvents just move it around and it has a tendency to creep everywhere. Abrasion is probably best but still might not do the job. There are specialist silicone removers (see 2nd link below) but I have never used them.

If you do a search you will find a few articles e.g.

Silicone Contamination Part 1
http://www.dowautomotive.com/pdfs/interim/299-51764.pdf
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(Post Link) post #5 of 5 Old 15-08-13 Thread Starter
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Thanks Clovis.

A great article! I have found a few articles and PDF's whilst researching yesterday. All of which I'll use when I contact the body shop.

I think I have a good case now to prove lack of preparation on their behalf, and not a fault of the bumper!
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