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Since I have a 66 Mustang I have holes in the body andfloor. I do not have a welder.
What is this stuff, where do you get it, and how does it work. (The original post may answer most of this generally but I have never heard ofor seen it before).
Basically it is glue made for fastening body panels. It is actually a two part epoxy. You get it at places that usually sell automotive refinishing supplies like paint. You can also order it on the net. Several companies make it but I think it is all pretty much the same stuff. Do a search for 3M Panel Bond or Evercoat Panel Bond. It comes in a tube just like caulk but is way more expensive...about $35 to $40 per tube. When you squeeze it out it actually comes out in two even strips of white and dark gray which you mix together. It can actually be used to install quarter panels. It is not intended for structural repair and the floors of a Mustang are structural since it is a unibody car. A small floor patch might be OK but do not use it to install an entire floor panel. It might actually work but the manufacturers say not to. I have found it is good for panel repair as long as you are not doing a huge section and as long you follow instructions. The metal must be sanded to clean metal...no rust. You overlap about an inch for the bonding. I put the patch on the inside of the panel and then use filler to bring it up to level on the outside. If you install the patch on the outside it will be higher than the surrounding metal. Wear gloves. This stuff does not come off easily. I bought a box of surgical gloves at the pharmacy for a few bucks. You get like 50 gloves or so in the box and they are disposable and fit so close and tight you can work...not like kitchen gloves or work gloves. You need to secure the patch while it cures by using clamps and sheet metal screws. Fasten it down tight. The bonder has little glass beads in it which prevent you from over tightening it and forcing out all the bonder. Cure is something like 8 hours but I leave mine 24 before unclamping and unscrewing. I then use a cold weld epoxy to fill the screw holes.