Is BP93 an E10 blend? That's all it took (10% ethanol) for Moroso A/B epoxy to soften up in my intake manifold.

It may not be a weight difference you see as much as a consistency change. The patches I put in my intake that hadn't been "ingested" by the engine had softened up due to exposure to ethanol and were able to be peeled back something like putty, despite all the footholds I'd created on the surface for the epoxy to bond to.

Definitely interested in hearing about your results w/ the coating.