Although they can be used at cold temperatures, epoxy coatings must be handled and applied with special techniques adapted to the environment at hand. Mixing an epoxy resin and a hardener together ...

This was true even if the epoxy was put in a vacuum chamber for degassing. The winning combination turned out to be a mix of 80% sand and 20% epoxy with a bit of black dye, vibrated for 30 minutes ...

One trick for getting the bubbles out of freshly mixed 2-part epoxy, aka degassing, is to go over it gently with the flame from a propane torch. But both the mixing and degassing take time.