Hi Everyone, I pulled the carpet out of my 78 yesterday and was disappointed to find rust in the passenger floorpan. To me it doesn't seem terribly bad. One hole smaller than a pencil. I banged on the floor around the hole and it seems pretty solid. What do you think? Is this worth cutting out and replacing or can it be patched? What would you recommend for a patch? BTW, what is the black stuff that they used to seal the seams? Where can I get it or is there a better substitute? Thanks.