Some kind of tar on floor pan/chassis...

[wrenchnride247]

zeroaxe, is there anywhere near by that can dip your pan in large vat of chemical stripper? If you are replacing the floor pan halves, cut those out and just worry about stripping the rest of the chassis. Have you tried aircraft stripper? Thats just the name of it, i use it to remove powdercoating. You can get it at paint and body supply houses. Hope this helps .