I wouldn't use that sealer again! Unless you want to hold those re-entry heat shield tiles on the space shuttle.....
I know others have chimed in about RTV and other things....but I've always used a paper gasket, typically Fel-Pro, with a light film of Permatex Type 2 non-hardening sealant on both sides. Never had a leak, never had removal issues, never had a hard time cleaning the surfaces.