3m does not make a product that bonds wood to plastic panle bond works on smc, f/b, and metal i wish i could help ya but i don`t know of a product that bonds wood to plastic plastic to plastic sure
sorry
Soak the mdf with fiberglass resin let it dry hit it with some 36 grit paper then use Fusor to bond it together. If ur gonna mould it to the panel grind ur joint down it is a lil then glass the seam knock that down with a grinder. Then u can use SMC filler to smooth it out and it'll bite into the abs panel like nothing else as well as the fiberglass so u wont have to worry about it lifting off the surface once it gets hot. Once u got it halfway slick epoxy prime it then u can do finish bodywork on the epoxy and it will be there. Prime with 2k and block just like any other body repair after that