While cleanin my truck with spray and wipe I noticed this bubble on the 3rd door where that overspray look is at the very bottom. At first I didn't think anything of it till i opened the door and it is directly on the opposite side of where the interior rust spot is. The whole seam is opened up and rusted in the middle of the door. I do not want to replace the door and im sure to have it profesionally done will cost me some major cash unless somehow insurance would cover it

My question is this, can I use that chassis save stuff or pro15 that can be applied directly to rust to prevent it anymore? then prime it and have it sprayed to match.