John, I shared your concern about applying Enduro poly over Arm-R-Seal. When I called GF several years back they said it was not a problem as long as the solvent finish was completely dry....they said 24-48 hours depending on temp. I've completed a number of projects with that schedule with no issues that I'm aware of. I think it's one of those things were the mfg's are covering their asses to avoid warranty problems with folks that don't allow the solvent to fully dry before top coating.