Used black Felpro RTV on fiber Felpro gaskets on engine and trans time before last. Had to use a paint scraper and a hammer to get both pans off with them out of the car. NEVER AGAIN!
I won't even tell you how long, or how many razor blades it took to get that crap off the block, trans, and both pans...
I won't go near Right Stuff or 3M weather strip adhesive for the same reason!
This last time I used Permatex Ultra Gray on the oil pan...JUST enough to stick the cork TO THE PAN.
NOTHING on the block side.
A dab on each end of the rubber pieces, nothing in the middle areas.
Sealed like a charm.
Transmissionion pan (chrome steel) got a Moroso Perm-Align gasket DRY.
NO LEAKS!