For what it's worth,

 

I really like West System Epoxy with West System 410 Microlight.  410 Microlight soaks into the resin almost instantly, no endless mixing.  West System Epoxy has a slow hardener and a fast hardener.  I have mixed up huge batches, maybe a quart of epoxy/microlight mixture using the slow hardener.  I wet out the surface with epoxy, and spread the microlight mixture.  I mix it really thick, so if almost crumbles.  I use a heat gun to warm it up and spread it out smoothly.  It works just like micro, costs more, sands more easily in my opinion.

 

Mike