removing the original interior floor insulation

probably because i have some left over from painting my gas tank. the floors are relatively bare metal - there is still some primer in places / bare metal where i have scraped it off. rust, nope, i just want to protect the metal before i put dynamat on it - just in case any water gets down there.
 
I used it on my interior floors as a protection layer years ago and has held up well. I have heard it does not do well in applications subject to UV light where it tends to degrade.
 
rsporsche said:
i have my skepticism that it would work like that - don't see any tar holding that insulation down.
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It may take some time but the extreme cold will shrink the tar like material and break that gooey bond. I used this method when pulling newer and cheap quality tar sound deadening out of a poorly restored firebird and it the whole sheet popped off in one piece! It was the type that has a sticky side and a foil/metallic top.
 
i gave it a bit of a go with some dry ice food packs, left it on for an hour - did not do much to the tar - the top layer came of reasonably well but the crystalized tar was still there. it may have softened it a bit, but a lot of scraping was still involved. this is the area above the exhaust pipe, so i imagine that is why it is crystalized.
 
report from the driver side - it comes off much easier than the passenger side ... i guess the heat from the exhaust makes a significant difference. in a couple of hours i have most of the drivers side off. i still have to do some cleanup, but it came off much quicker. i did the rear seat with dry ice packs and the front just as it was and i have to report there was zero difference - the tar was still there ... and i left the ice on it for over an hour.

what i have found on the tar is to use a 1.5" wood chisel turned upside down and laid pretty flat and tap with the hammer or just push / scrape and most of it just peels off.
 
quick update - 'goo gone' makes really quick work of the tar residue. spray it on, let it sit a short bit, turn the chisel upside down and push ... it just curls up. after the big chunks are gone, then its a light scrub with the rough pad and a wipedown with paper shop towels. the downside is that the color of the panel turns a bit 'brown'. will use a waterless cleaner to prepare it for the self-etching primer.

i've got to finish the tranny tunnel, and will go back over the passenger side ... since i hadn't used the goo gone on it.
 
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