[mrennie]

The Bondo version is slightly different than the 3M stuff and is harder to sand. If you didn't have both to compare, you wouldn't know any better, but the 3M stuff is better to work with IMO.

There is a cheaper twin cartridge gun for larger 300 mL twin cartridges, and if you buy one you can wrap the 3M tubes in a few layers of cardboard from your favorite canned beer case, it will sit in the gun OK and you can use those smaller cartridges.

I wasn't willing to spend $200 for the proper autobody twin tube gun, but $50 for the larger gun was OK for 2-3 uses.

Something like this one, intended for 300mL cartridges. The pushing pads won't be centered in the tubes but it will still work. I used the same gun to dispense 3M NVH foam as well as Norton epoxy seam sealer from the smaller tubes so I feel like it was a good choice.

Also, some parts supply houses (my local Napa is one), bought the proper gun and would lend it to customers who bought the smaller tubes from them. I am a slow worker (see sig ) so I wanted my own for when I needed it.

https://www.ebay.com/itm/28530579201...Bk9SR_iHwKubYw

As long as the repair product you buy is a flexible epoxy repair kit, it should be fine. I used 3M (both in tubes and cartridges), Bondo, and a Canadian product from Dominion Sure Seal. The 3M sanded the best, the Bondo was the worst, and the Sure Seal was noticeably softer than the others once cured and did not feather as well.