there's a great alternative that will help you achieve crispy-clean caulk lines. Painter's tape! This method involves applying painter's tape along both sides of the area you plan to caulk ...
4" x 50' Foot Contin ROLL of authentic Eternabond repair tape. Bonds to surfaces and stops leaks. Use on: EPDM, TPO, most PVC, CSPE/Hypalon, CPE, SBS, APP modifieds, asphalt BURs, coal tar BURs ...