: When putting on more than just 1 layer of glass, are you waiting until the
: first layer epoxy has hardened but is tacky prior to adding the second
: layer or are you laying both layers at the same time then applying the
: epoxy to both at once???

: If you can do it either way, which is best?

You can do it either way - or actually you can also wait until it's fully cured, then wash and sand the surface before next coat.

And which is best? Well I think it depends on the situation. Sometimes it's good to wait until the first layer is tacky - theyn you won't accidentally move the bottom layer when spreading epoxy and glass. In some cases it's easy to go and put several layers in same time. So I would say it depends on a situation and personal preferences. Try both and see what works for you