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Re: Firewall insulation
No. I had the floor and back wall of my 76 sprayed with RhinoLiner and it was a bad idea. I got a lot of heat off of the transmission hump, and the floor was slippery when wet - the cottage cheese surface wore off quickly from my feet moving in and out of the truck. I put floor mats over the RhinoLiner but the mats would slide around a lot.
I would just clean everything out well and sand, repaint if necessary. POR or similar paint is recommended by others for minor rust issues after repair. Use stock or aftermarket insulation for a better result. Just regular carpet and Huskyliners work best for me, along with Walmart treadmill mat over the hump and on the exposed carpet area by the door entry.
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