Optex Super Build 4:1 Polyester Primer Surfacer

Anyone have experience with this Primer? It's supposedly a hybrid Epoxy Polyester primer. Before joining Make it Match, I purchased a gallon of this stuff for my current build (Fiberglass body dune buggy). I just read through the classroom section on primers and learned that Polyester may not be the best primer to use on Fiberglass. Looking at the TDS, it does include Fiberglass in the substrates its suitable for. Would love to know your thoughts

@Aaron Jokela

and I apologize for the number of questions lately. Seems that every Saturday I have other commitments that I can't join the weekly call.

BTW TDS sheet link is here

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Optex Super Build 4:1 Polyester Primer Surfacer