Have not used West Systems but as per someone elses comment have used Z-Poxy Finishing Resin for all my glass work for years. Nothing fancy, might on ocassion this with a tiny bit of 91% Iso then use old playing cards to squeegee it out till just the fibers are wet but no standing resin. Have never had a failure or any de-lamination using this system.
Epoxy glue "can" be used for application of fiberglass but as someone has pointed out it's not the correct tool for the job, does not sand well, does not take paint well and certainly does not hold up to UV rays if left exposed (will yellow VERY quickly and become brittle almost as fast)