Many decades ago, the most common bedding material was Brownell's Accraglas that came in a red box. Included was a bag of gray-white powdery stuff that was probably asbestos. This was to be mixed in with the epoxy/hardener combo to provide a thicker & less runny consistency. A gunsmith pal of mine used this stuff. On stock bedding days 5-6 rifles were lined up, each resting in notches cut in carboard boxes with stretchy rubber surgical tubing clamping metal to rough formed stocks. Gobs of bedding material oozed out to drop onto layers from previous jobs on the bottom of each box. The hardened epoxy was removed during final stock shaping. Everything sure looked ugly at that point. Some of the wood blanks (super good grain flow & everything else) cost $100-$200 (old time $) so a complete application of release agent was needed to prevent a stuck in place disaster.
Titanium must be the primo bedding agent additive. Extremely strong, corrosion proof, light weight - much better than asbestos. I never used Vaseline over shoe polish wax fearing the Vaseline would act as solvent on the wax - it deserves a trial run.