Originally Posted by musigenesis
I'm not sure Bondo is commonly used to fill bolt holes in the floor (although I'm sure everything has been used at least once). It would probably work OK, I guess, unless it had some problem with adhesion.
By "wheel well edges", you mean the semi-circular cutout on the outer skin?
Some pictures of your bus and the rust situation would be helpful.
Sure. Bondo has been used pretty widely. I did plenty of forum research. Here is the steps for what it is worth that seems to be working well:
1. Wire wheel floor
2. Rust converter / sealer.
3. Grind bolt hole areas clean for good surface and bondo.
4. Re-apply Corroseal over the floor.
5. Glue down 1/2" runners along the exterior with Locktite PL
6. Add 1/2" iso board and glue with Locktite PL
7. Add 5/8" T&G ply glued to Iso and screwed at the exterior runners.
The Corroseal product has been a good one. Through its hardening process it makes a plastic like film and hardens. Feel like another coat to re-cover everything is a good idea prior to insulation to create a solid near 2 layer vapor barrier.