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I would not call myself an "expert" at infusion ... I probably only really have limited experience.. But:
Polyester resin is just pure trouble, even when trying to vac-bag it ... tried that .. did NOT like it...
I'v never used VinylEster, so no experience there..
I've tried at least four different resin systems for infusion, only one ( EC IN2) worked perfectly, given a perfectly sealed bag, no degassing, the resin degasses perfectly during the infusion, as far as I can see in my smallish projects.
I've infused West systems 105, and it works too, but has very slow infusion rates, again, it seems to degas fine during infusion.
(completely Pin-hole free parts are rare with this resin)
EC EL2 seems almost identical to West 105 when infusing it. (Again almost always a small number of pinholes, my theory is that the higher viscosity resin traps more gas in the fabric.)
EC High temp will infuse, but it is near impossible to get pin-hole free parts. It helps to heat the resin to maybe 30 - 40 deg, but infusion then has to go quickly and without problems, or you may run into trouble with the resin either exotherming in the pot or gelling at the last part of infusion. Consequently I usually degas, wet-lay and Vac-bag, going rather resin rich.
"Sapere Aude"... Dare to KNOW!
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