Thanks for the replys so far.
I have tried the heat gun.
I have tried the solvent (a few different types)
I have tried the putty knife.
I tried some dry ice and shocking the panel.
I have not tried the pressure washer, although I don't have access to a 4500psi unit.....that is a lot of pressure.
Mine gets close to that so I will give it a go, thanks.
The undercoating on this particular trunk is still flexible, and REALLY thick.
This is probably why the trunk floor is basically primer perfect underneath it all after all these years.
I was hoping there might be a less messy, less involved method for removal but I guess I'm in for the long haul, and getting this stuff everywhere is likely as I remove it.
Hey, at least it is not a 3/8" think layer of anti-seize.