Clark, this here is an RV
This RV came in the other day to get a busted up roof and side panel repaired. The previous owner obviously hit something but no one really knows what or how it happened. The side of this RV are made of a thin wood, with a layer of fiberglass over it. I chose to use a very strong, two part epoxy that must be heat set to dry. This means that after the product has been mixed and applied, you must heat the product up before it will cure. That is the yellowish filler in the first picture. Once that was sanded down smooth, I did apply another layer for strength. Then a layer of body filler was applied to smooth it up a bit more. I did get primer on it today as well, I just forgot the picture. Again, tomorrow I hope to get it painted so the owner can cruise.