I might clean the area well with laquer thinner. Rough the surface as well a little to increase bonding. Tack place pieces of tin using mar glass or commonly known in the trade as short hair fiberglass filler. It has enough body to be easily workable overhead. When all are in place just seal all the patches edges with a layer of the mar glass. That's after they are all tacked on with the mar glass.

This will allow you a test. The important thing is to use the laquer thinner as it leaves no trace of oil behind when the white wiping cloth shows no residue.

I cannot think of any other solvent to cut that oil off as well as it will. Plus it dries fast on the surface. The mar glass having the consistency of normal body filler that is of no use to you. Makes it far easier and cheaper than trying to work with a resin in an overhead position. If you use almost anything other than the laquer thinner the bond will be compromised.