best bumper primer/sealer - Pontiac GTO Forum
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post #1 of 8 (permalink) Old 02-11-2018, 08:36 PM Thread Starter
 
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best bumper primer/sealer

Hello, can anyone recommend the best sealer/primer for my 1968 gto bumper? It is already sanded and all little repairs are done. thank you
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post #2 of 8 (permalink) Old 02-11-2018, 09:15 PM
 
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Hello, can anyone recommend the best sealer/primer for my 1968 gto bumper? It is already sanded and all little repairs are done. thank you
All I can add is that whatever paint you select, it needs a "flex agent" to be added to it. This keeps the paint pliable rather than hard & brittle which will flake off the endura bumper. You might want to check with your local auto paint store as they should be able to help.
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post #3 of 8 (permalink) Old 02-11-2018, 09:27 PM
 
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Hello, can anyone recommend the best sealer/primer for my 1968 gto bumper? It is already sanded and all little repairs are done. thank you
What did you use to make the repairs? Find out what product works best with whatever you used. Did you skim coat the entire bumper or just make spot repairs?
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post #4 of 8 (permalink) Old 02-11-2018, 10:13 PM Thread Starter
 
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spot repairs with polyester flexible. there were a few spots that were repaired years ago with plastic I was wondering if it is just easier to buy one from ames
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post #5 of 8 (permalink) Old 02-11-2018, 10:51 PM
 
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I don't think flexible polyester is going to bond to the substrate very well but I don't know for sure because I never tried it before. I did ask my Evercoat rep and they said it would not work on Endura bumpers. Every person I asked said that a two part epoxy is needed to repair the Endura bumpers. SEM and 3M are the two brands that I know of.

I guess it all depends on what your goals are.....if you want a very high quality finish that is likely to last a long time then the usual method is to have the bumper media blasted and then make your repairs. Deep cuts or gouges need to to be v cut so the epoxy repair can fill the groove and bond well. The SEM product has a primer product they recommend. The 3M product can be sanded to 320 grit and then primed with whatever primer works with the paint brand you are using. The primer should have a flex agent or compatible for use on today's rubber bumper covers (most are). If using a modern paint for color coat then you shouldn't need any special additive since modern paints are designed to use on flexible panels commonly found on newer vehicles. There is also a method to use your base color coat as the primer but that is a bit expensive since it requires quite a few coats to work properly.
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post #6 of 8 (permalink) Old 02-12-2018, 08:54 AM
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Do *NOT* use regular primer/surfacer. I made that mistake on mine and wound up having to get it all bead blasted off when it cracked. If it doesn't need any repairs, then a good flexibile epoxy primer is all you need. I wound up using Southern Polyurethanes Epoxy Primer on mine. It's flexible enough without needing additional flex agent. If you have spots that need repair/filling, I'd probably try filling them with something like RTV silicone or similar, then a flexible epoxy primer over that.

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post #7 of 8 (permalink) Old 02-12-2018, 02:49 PM Thread Starter
 
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Thank everyone.
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post #8 of 8 (permalink) Old 02-12-2018, 03:31 PM
 
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I will be using SEM 39134 flexible primer surfacer for my 68 front bumper. I used SEM 39847 multi-plastic repair epoxy to fix any chips or low spots on the bumper. The tech sheet recommends their 39624 World Class Flexible Primer Surfacer which is a waterborne version of 39134.

I have also used 3M Automix 5896 EZ sand flexible parts repair to fix chips, gouges etc and it works just like the SEM stuff. I actually like the 3M stuff a little better since it comes in squeeze tubes so it's easier to use since you mix small batches at a time. The SEM stuff is in a cartridge with a mixing application tip and requires a special gun for the cartridges. According to my 3M rep....the 5896 EZ sand has been discontinued and replaced with 05895....still in squeeze tubes so that is a plus.

Hope this helps.

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