AdTech P-17 High Performance Filler

This putty works for either tooling or marine applications.  It bonds to fiberglass, SMC, BMC, RIM, and most other substrates.  Every shop should have some.
A tube of appropriate size will be included with your putty.  P-17 Black putty comes with black hardener,  gray comes with red BPO and the white putty comes with white BPO, but if you want a different color (black, red or white), just write it in the notes section at checkout. If you want more than the required amount.