On the rear fenders, I ended up fixing them.
Here is result; I cut the HVAC strap and used the rivets as discussed.
Put them on dry. This should ensure the don't flop around and the crack does not propagate further.
![](https://lh3.googleusercontent.com/-tWcv4aO4V0g/VoHKAdAdyFI/AAAAAAAAXt8/y4eP6gk3Ldg/s400-Ic42/2015_12_28_18_47_11.jpg)
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I then applied the goop to the inside, prior cleaned with rubbing alcohol.
![](https://lh3.googleusercontent.com/-0viDnjLtnGs/VoHKBVp9_8I/AAAAAAAAXuI/EE9R4O3T9Cg/s288-Ic42/2015_12_28_18_47_17.jpg)
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![](https://lh3.googleusercontent.com/-Bs2Hh2U5HZU/VoHKCPS8aYI/AAAAAAAAXuU/XsuNvZCVuP4/s288-Ic42/2015_12_28_18_47_18.jpg)
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It dries very quickly, but has some flexibility like the label said.
The goop costed $5 at home depot, I was not sure if it was going to work, I feel it will enhance this fix.
As a back-up I got 1 quart of truck bed coating, seriously I was going to coat the inside and outside, letting it dry, but now i feel no need,
That stuff is $20/quart, I'll be returning it tomorrow.
Will let them fully cure for 48 hours before putting back on.