Vinylester and polyester aren't the same thing. I had it explained to me that it can be thought of as similar to a polyester at one end, and similar to an epoxy at the other end of the chain. With properties in between.
My one class in composites was back in the 1990's so take it with a grain of salt. I do know that the curing agent is more like polyester.
I used vinylester last year, and it sticks to polyester and epoxy. I used it as a primer coat between epoxy and a polyester gel coat, and it is tenacious. I hear it is often used as a barrier coat on epoxy sailboats.
I like it enough that I want to use it more. It is safer than epoxy from a sensitization standpoint, higher performance than polyester, and compatible with either.
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