Man, I have tried everything. I need to be careful, because I am not going to remove all of the old undercoating- I am going to apply more Wurth stonguard over it, where it is in good shape I'll just feather the edges.
So, I don't want to use any chemicals that might get into the old undercoat and affect adhesion of the primer and new undercoat.
WD-40 has always been my go-to for a solvent to remove stuff like this from an aircraft belly, but I'm afraid that it will get into the old undercoating.
What have you guys used (besides bourbon) to keep yourself sane when removing the cooked-on grime ?
Any ideas appreciated!
