2 hour epoxy is close to the laminating epoxy. (not exactly the same stuff, but same consistancy, and works better than 30 min for fiberglassing)

Slower cure epoxies are less tollerant of the mix being off a small amount. You must carefully measure 2hour epoxy in medicine cups, DO NOT COUNT DROPS! The drops for the 2 parts are not the same size! If yo are off just a little on the proportions, the epoxy will remain tacky for up to 5 days. If it stays tacky longer you have a problem. (it very hard to clean the unset epoxy out of the wood.)

It is very easy to use excess epoxy when fiberglassing. You apply the epoxy to the wood, then scrape it off with a credit card. then lay on the cloth. Then carefully rub the cloth down smooth (wear gloves...) Any place the cloth does not turn transparent you need a little more epoxy. (try to rub from a place that is transparent toward the white... THEN apply a tiny bit of epoxy if needed.)

Excess epoxy does not add strength, just weight.