Re GRP and temperatures, its very forgiving. Anything over freezing and it will go off, just add more catalyst. A lead lamp with a filament bulb our under the job, then covered with a tarp will bring the temp up locally to set it off if you do have a problem.
One thing though if it is cold, mind as you breath out you don't get condensation where you are about to put on the resin. That tiny bit of contamination will make it go milky and it won't stick as well. Just hold your breath!
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