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How to fix warped bumper cover??

 
Old 03-25-2010, 01:33 PM
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Dean_Fuller
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Default How to fix warped bumper cover??

I'm starting to prepare my son's 1980 for a paint job I will be doing this spring and wanted feed back on how to flatten this area. Will a heat gun alone do the job or is there an adhesive that I need to inject??? His car is paint code 708...black metallic so any little thing will look terrible if not corrected.

Thanks in advance, Dean
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Old 03-25-2010, 01:50 PM
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Unfortunately I can't offer any advice but I think it would be hlepful to know if there is anything pushing it up from underneath? I'm assuming no but it's hard to tell from the pictures.
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Old 03-25-2010, 01:54 PM
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Heat gun should do it, be careful to not melt the bumper cover though!!!!! Joe
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Old 03-25-2010, 03:58 PM
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Originally Posted by Marine Blue View Post
Unfortunately I can't offer any advice but I think it would be hlepful to know if there is anything pushing it up from underneath? I'm assuming no but it's hard to tell from the pictures.
It all looks fine under the cover....nothing pushing it up.
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Old 03-25-2010, 04:09 PM
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Dean,

I think there is a bolt around that location, are you sure the tap did not break or if the bolts is there?
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Old 04-15-2010, 12:29 AM
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After taking the bumper off to paint I saw the metal backing strip that screws to the fender had a bend in it. I straightened it with pliers and a screw driver and the bump is good to go. Just thought I would follow up with what I found in case it could help some one else.
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Old 04-15-2010, 12:52 AM
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stay away from the PU cover with a heat gun, if you must use heat sit the cover in the sun on a blanket this will usually reform the PU cover it may take a few days to do this.
Glad you found the metal causing the misfit
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Old 04-15-2010, 09:05 AM
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That's been stretched. Not much you can do for it. Mine is the same way on one side.
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Old 04-15-2010, 10:05 AM
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What's the reasoning for not using a heat gun other than going crazy with the heat and doing more damage than good? Does it mess it up more in the long run? Are there other ways to straighten them out without heat or sun?
My front bumper cover was warped all along the edge where it meets the fenders and hood. I heated it up just a little and then persuaded it back in place a little bit at a time.
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Old 04-15-2010, 11:15 AM
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I agree with using heat to fix the plastic covers, just be VERY careful. When I bought mine the previous owner had backed into something, collapsed a rear bumper shock and deformed the plastic and it didn't come back even after replacing the shock. I didn't have a heat gun handy, so I used a torch, and a spare set of hands. I heated up the front while someone pushed a curved sheetmetal dolly from behind it. Now it looks perfect, but the torch or the impact one caused the paint to pop, but it's barely noticeable since it's right beside the bumper pad.
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Old 04-15-2010, 02:00 PM
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Originally Posted by Dean_Fuller View Post
After taking the bumper off to paint I saw the metal backing strip that screws to the fender had a bend in it. I straightened it with pliers and a screw driver and the bump is good to go. Just thought I would follow up with what I found in case it could help some one else.
That was my initial thought.

Glad it worked out. Can't wait to see the finished product.
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Old 04-15-2010, 02:34 PM
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These covers were first gen, the S4 ones were much better, for my resto of the S2, I bought two new covers, even they were not perfect from factory, I have to use special bumper filler to get them how I wanted them. It takes a fair bit of work but 8 years later they are still good, the car does live in side though. The other 928 I restoed, I also filled the bars and that also improved them, its gets rid of that warped look, if you need the name of the filler I can find it for you.

Greg
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Old 01-17-2016, 06:46 AM
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Default Porsche 928 1st Gen Bumper Restoration

It's my first post here regarding Porsche 928 1st Gen Bumpers. I have a 1979 low milage car which is immaculate , however both front and rear bumpers have tiny little stress fractures that look like spider webs. The panel shop completing the initial repair did a great job but when the car sat in the sun it starting showing these tiny little lines where the paint was drawn into the stress fractures. Any advice on how to cover these up with a special filler perhaps flexible?
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Old 01-17-2016, 09:56 PM
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It's good to know that it was the reinforcement, but I had the same problem with a nose out of alignment that took a set after some years of being mounted without all of the bolts tightened. I took the nose off, straightened the reinforcement, and left it in the summer sun for a couple of days with some 4x4's strategically placed to help put the alignment back where it was when new. After bolting it back up, you could never tell it was ever warped. Don't use a heat gun if you can help it. It will soften a localized area and not the whole unit. You would want to relieve all the stresses in the nose (or rear bumper) so that the memory of the molded part will prevail in returning it to its original shape.
My two cents.
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