[flyingfrizzle]

A lot of the time when it is cold outside and I cant do the work in my heated shop I will pre-heat the area with a hair dryer/heat gun and then once everything is laid I will heat the lambent slightly and once it starts to kick I found that the reaction of the vinyl-ester will produce enough heat to finish out the cure at its own natural rate. That's using 1%-3% mek. I don't like adding extra mek due to it getting brittle. But like you said a lot of the time the sun will provide all the heat you need to get it going. When I did my swim platform I laid it up in the shade and then carried the mold out into the sun to help it kick and soon as the sun started warming it started to cure out at a normal pace. Also sometimes I will turn the a/c on and cool off the shop to do all my lay ups and once Im finished I will switch to heat and bring it up to 85 degrees or so. That buys me more time to lay up everything and then get a good cure. I even cool the resin outside in thee cold and bring down the temp of it too but it gets thicker when I do that and makes it harder to absorb in to thick layers.