:bowtie: Im working on a door that all the dent's have been taken out there is a sink that it will come out but with some pressure is put on it, It colapses back in. Is there something i can do to strengthin it?????

Sounds like the metal is stretched. I fixed one once by running a weld in the middle of the collapsed area, tightened it right up! (be warned that you chance making it worse as well)

Heat the area with a torch then apply a wet rag to the stretched metal to shrink it.