In my opinion, a low-volume builder would never be able to afford the elaborate "closed mold" system that Genmar is using (VEC).
The Shape of Things To Come
However, custom race boat builders have been using the vaccum-bag technique in many forms of racing for many years. Albeit some systems are crude -- they still get the job done.
But this type of vaccum bagging is not to trap VOC emissions, it is used to squeeze the resin so that it penetrates the cloth evenly. The excess juice then is sucked out, creating a much lighter lay-up.
Since the early 1990's, resin manufacturers have been formulating low VOC resins and solvents to reduce styrene emissions. I believe that in California, the law is that large builders are fobidden to use anything BUT these low-styrene products at this time.
Here's one example:
Industry's First Tough, Low VOC, Modified Vinyl Ester Hits the Market
Interplastic Corporation is pleased to announce the availability of the industry's first tough, low VOC, modified vinyl ester resin (MVR). The CoREZYN® VEX201-307 resin is designed for marine, tooling and general composite applications. It features excellent physical characteristics, surface quality and blister resistance.
"For those manufacturers faced with choosing a low-styrene product, this resin will give them the toughness and strength of traditional vinyl esters plus compliance with EPA regulations," says David Herzog, technical director, Interplastic Corporation CoREZYN Division. The product's styrene/VOC level is below 35% which also is below the projected EPA requirements.