metal cleaning tech

[Daves55Sedan]

I'm considering having my trunk lid "dunked" in metal cleaning solution (which removes all old paint and rust).
Some of the bituminous/tar substance that was sprayed on at the factory on the underside has fallen off and slid down to the bottom of the trunk lid at the back. When the metal sweats in late evening and morning, the dew runs down to the bottom and collects with all those chunks creating rust-holes
At this point, it is going to be extremely difficult to rebuild that bottom with new sheet metal, but first, that stuff is going to need to be cleared out.
So here is the question: after the sheet metal repair is done, what can be used to duplicate or replace the tar substance that was once used as an insulator between the trunk lid and substructure. And how could it be applied, since that area in the very back is closed in by the substructure?
One idea I had was to lay the trunk lid upside down and actually dump a quart of marine primer on the underside of the trunk and allow it to flow down into that closed space, then drain the excess out one of the weep-holes at the bottom.
Any other workable ideas?

[evintho]

I've stripped the underside of my decklid and covered it with epoxy primer. I'm about ready to jamb it with color coat. After that, I'm gonna try and fill the voids with this self stick neoprene rubber.

https://www.amazon.com/Dualplex-Neop...89&sr=8-6&th=1

[GLAmes]

I used multiple layers of undercoating. Sprayed a layer, let it cure for about a week, then another coat.

Prior to dunking it I suggest you suck as many pieces of that stuff out as you can with a shop vac. It took some shaking and patience but I got all mine out.

[Ole Don]

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3M rubberized undercoat in a rattle can. Good stuff.