Aircraft Spruce has this for $30.95 a gallon. at that price it becomes a more practical alternative.

www.aircraftspruce.com

And they have this blurb about the product:

VINYL ESTER RESIN
MEDIUM PROMOTED: Includes CONAP, DMA and other additives. Add MEKP for complete cure:
P/N 01-07350 $30.95

Dow Chemical's Derakane 411-350 PA Vinyl Ester Resin is an epoxy-based Vinyl ester designed to provide superior toughness and high corrosion resistance. Many leading kit aircraft manufacturers use vinyl ester resins extensively due to its quality and ease of fabrication. We furnish medium "promoted" vinyl ester 411-350 PA resin which includes CONAP, DMA the resin is cured by adding the MEKP which is furnished with the kit. Gel times vary according to the amount of MEKP added and the ambient temperature. Shelf life of promoted vinyl ester resin is short at only a few months.

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I'm intrigued by the concept that this is an "epoxy-based" material. Maybe someone can explain that particular chemistry to me.

PGJ