Closing the sills would require a 3 dimensional plug fitted around the coolant hoses and A/C tubes, but I didn't want to dump 10 pounds of spray foam in there. I wanted something I could remove relatively easily if need be. I got CLOSED cell packing foam from some server boxes from work and pieced together a jigsaw puzzle, and building from the bottom up like a layer cake.
I glued the pieces to the fiberglass and each other with Goop, and sealed all edges with latex spray foam. Latex = water cleanup. Polyurethane = ruined paint and leather.
The frame extrusions were "sealed" with gray gaffer's tape, which I replaced with latex foam.
The car smelled like Goop (tolulene) for 3 days, and then gloriously clean. I drive it every chance I get.
I repeated the shop-vac test and got nothing. Interestingly, from the shop-vac suction, air now blows from the dash vents. I don't think it did before.
I think I had a combination of gas vapor from the leaky charcoal canister valve getting drawn through the right side sill, and (probably) VOCs inside the sills, both passing through the dash.
I glued the pieces to the fiberglass and each other with Goop, and sealed all edges with latex spray foam. Latex = water cleanup. Polyurethane = ruined paint and leather.
The frame extrusions were "sealed" with gray gaffer's tape, which I replaced with latex foam.
The car smelled like Goop (tolulene) for 3 days, and then gloriously clean. I drive it every chance I get.
I repeated the shop-vac test and got nothing. Interestingly, from the shop-vac suction, air now blows from the dash vents. I don't think it did before.
I think I had a combination of gas vapor from the leaky charcoal canister valve getting drawn through the right side sill, and (probably) VOCs inside the sills, both passing through the dash.