cutting and glueing a urethane bumber cover back together

O

OJ86

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Long story short, I need to open the wheel opening on a car some for tire clearance, what would be the best product and procedure to cut a section out of the rear cover and rebond it. Here is a picture of what I am talking about. Sorry its sideways, photobucket is fighting me today.

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I had to repair the urethane bumper on my MachI by extending both sides where it meets the fenders. Each side was about three inches too short. Anyway, I made the repair about seven years ago and it's still holding up well although there is no stress on it. I can remember what I used...seems like it was either a 3M or a Fusor product. I'll dig around and find it when I get home and let you know.

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Did you use any strips on the backside where the seam was? I was planning on using the 3m backing strips.
 
Sorry. I had something come up yesterday and I didn't get a chance to go out to the garage. But I definitely will today.

I didn't use anything other than the repair material. No backing strips. At the time of repair I couldn't find any information on repairing those bumpers so I just had to wing it. What I did was redneck, and by no means professional, but it worked. I found a peice of urethane mat, almost like a floormat, that was the same thickness as my bumper skin. I cut a large saw-tooth pattern on the mating areas (see attached) and beveled both sides. I just did the saw-tooth pattern to give me more surface area. The stuff I used was a two-part mix like JB Weld or other epoxy. I mixed it up and put it between the two peices and taped them together. Once that cured, I sanded down what gushed out when I pressed them together, mixed up some more and filled in my bevels on each side, leveling the surface. After that it was just blocking and priming and so forth. The repair material is really flexible and sturdy.

Like I said, this was new to me and I'm sure others will have a better way to repair something like that but mine has lasted several years with no issues so I just thought I would throw it out there. Forgive my kindergarten style drawing, but I never took any pictures of the repair and the paint program on this computer sucks!

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I was taught to use drywall tape on the backside of the repair. Well, they sell fiberglass mesh tape for bumper repair, but it is just drywall tape. Gives the repair a bit more structural integrity. I am pretty sure the 3M stuff is just fiberglass mesh, too.

Sounds like you got it taken care of, Prplpny, sorry I did not add my 2¢ earlier.
 
If you use something strong like the 4040 Duramix/3M, you won't even need to use the drywall mesh on the back.

Be sure to use plastic adhesion promoter before you apply adhesive and any recommended skim coat..
 
The number I tend to use is fusor 100EZ, as it can be used for structural and cosmetic.. It works pretty good, it's a heat set formula, so you have to heat it for it to fully set..
I have mixed it and applied and let it sit a few hours because it will slowly harden over time, by doing that it won't be as runny when you heat it with a gun..
It can be weird to use but I like the final results.
 
I use a stainless steel fine mesh on the back side
Put it over the joint
Melt the plastic through the mesh with a heat gun
Very effective and strong

Use multiple 2 inch strips or whatever size would be effective
 
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