I'm desloshing my '91 RV-4 tanks and the access covers had cork gaskets. I plan to seal the cover plate with proseal only.
I'm wondering what the black stuff is on the outside edge of the doubler for the cover plate? It is soft. Is it old proseal that broke down or something else? Should I try and remove it and put a ring of proseal around the outside edge of the doubler ring?
I'm wondering what the black stuff is on the outside edge of the doubler for the cover plate? It is soft. Is it old proseal that broke down or something else? Should I try and remove it and put a ring of proseal around the outside edge of the doubler ring?