69 camaro urethane front bumper job.

C

CK-2

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I have a urethane bumper I’m wanting to put on my car. What should I spray as the foundation for this job? Bulldog adhesion promoter, epoxy, 2k urethane primer? I have a few tiny almost like pinholes to fill with some icing but other than that it’s in good shape.
Just want the paint to stick. I’ve done several bumper covers but this is my first urethane bumper.
 
First off, it's urethane so no adhesion promoter neccesary. Wouldn't hurt though to take a small sliver from somewhere on the bumper and test it in a glass of water. If it floats you need adhesion promoter, if not you don't.
Epoxy would be your best choice. I would only use epoxy on it. No 2K. Epoxy is flexible and perfect to use on that cover.

Supposedly it was a factory option. I've never seen one though.
 
Chris_Hamilton said:
First off, it's urethane so no adhesion promoter neccesary. Wouldn't hurt though to take a small sliver from somewhere on the bumper and test it in a glass of water. If it floats you need adhesion promoter, if not you don't.
Epoxy would be your best choice. I would only use epoxy on it. No 2K. Epoxy is flexible and perfect to use on that cover.

Supposedly it was a factory option. I've never seen one though.
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I’ve seen several. A used factory original goes for 2-3k depending on condition. And I’ve seen some rough ones going close to that. I’ve seen the original brackets bring $600 by themselves. Crazy This is an aftermarket. I’ll do the float test. Can I build the epoxy to block?
 

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CK-2 said:
I have a urethane bumper I’m wanting to put on my car. What should I spray as the foundation for this job? Bulldog adhesion promoter, epoxy, 2k urethane primer? I have a few tiny almost like pinholes to fill with some icing but other than that it’s in good shape.
Just want the paint to stick. I’ve done several bumper covers but this is my first urethane bumper.
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If you are curious about SPI epoxy flexibility, check out this post: http://www.spiuserforum.com/index.php?threads/spi-epoxy-flexibility.8595/
 
CK-2 said:
What’s the best way to apply the epoxy for building?
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How I've done it in the past. Let it induce for a minimum of 30 minutes, an hour is better. Then 4 coats giving it a minimum of 30 minutes between coats, again one hour is better. Sanding, wait the full 24 hours as a minimum, sand with 150-180 grit to start. If you can, let it sit several hours in the sun before sanding, that would be even better. For those pinholes use a toothpick and dab some epoxy in them.
Block it and repeat if necessary.
 
Chris_Hamilton said:
How I've done it in the past. Let it induce for a minimum of 30 minutes, an hour is better. Then 4 coats giving it a minimum of 30 minutes between coats, again one hour is better. Sanding, wait the full 24 hours as a minimum, sand with 150-180 grit to start. If you can, let it sit several hours in the sun before sanding, that would be even better. For those pinholes use a toothpick and dab some epoxy in them.
Block it and repeat if necessary.
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After sanding with 180 would you reapply and block with 320 or so? Then seal and paint?
 
The longer you let the epoxy induce the better. It will start to thicken some the longer it sits mixed. When you want build you can mix some and let it sit overnight then spray the next day. And when reapplying mix your new epoxy in with any leftover from the previous application.
 
crashtech said:
This might be obvious, but I though I ought to mention it anyway. I think this bumper should be carefully test fitted before going too far. I would be very suspicious about it fitting properly.
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I have it on the car fitted now. The first reproduction version of these bumpers came out years ago and the fit was awful. I bought one 20 years ago, test fitted it, decided it was junk, hung it on the garage wall 19 years ago and then sold it a couple months ago.
That’s why a used OER was bringing thousands of dollars. Anyone that knew anything about these wouldn’t buy one. So they recently retooled and brought out this much improved version. It fits much better with a little tweaking. Not as good as the originals but not $2-3k either.
 
NextGen Classics said:
Any production figures for this option? Also was your car originally equipped with this?
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As in how many cars had this option? My car wasn’t equipped with one originally, but I’ve always liked the option, and it’s an easy bolt on change.
It was known as the V3 A1 option in the assembly manual for a 1969. The slang term for them was Endura and that’s what they’re most commonly know by.
 
Only 5 percent of the 243,085 Camaros produced in 1969 rolled off the assembly line with the Endura bumper as an original option. "
 
Chris_Hamilton said:
Endura was the brand or trade name of the urethane used. Much like plexiglass is a brand/trade name of acrylic.
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well due to life getting in the way I’m just getting started on this bumper. I did a float test and the sliver definitely floated. So should I definitely use the adhesion promoter before epoxy?
 
CK-2 said:
well due to life getting in the way I’m just getting started on this bumper. I did a float test and the sliver definitely floated. So should I definitely use the adhesion promoter before epoxy?
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yes. If it floated it's not urethane. More than likely TPO or some other variant. Cheaper to produce than urethane. Scuff stuff and a grey scotchbrite pad, then wipe down with SPI 700 or alcohol. Important to use a waterbased W&G remover. Then follow the instructions on the SPI Ad-Pro that is in the Tech Manual. Follow up with epoxy while the ad-pro is in it's recoat window.
 
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