Teardrops n Tiny Travel Trailers

It will vary by product, but for West System I have found that the "Fast" 205 hardener is good to apply down to about 45 deg F and can be used for smaller layups up to about 68 deg F, if you work quickly, or for small thickened spot fill jobs.

For bigger layups, first time users, and/or hotter temps move to the 206 "Slow" hardener. The 'slow' is okay at lower temps, too, it just takes even longer to kick.

YMMV with conditions and differences in technique.

I have mostly been laying up 2 plies of 6oz cloth over foam board or wood, and seldom do layups of more than about 4 sq yds area. For larger layups I have been working dry on dry, usually pushing the epoxy thru both plies at the same time.

Size of the mix will also affect the way it cures. I large mix pot will kick off faster than one spread out & very thin. If it's setting too fast, lower the temperature of the resin & catalyst before mixing, ice bath or something.

If you just have the slow set stuff & it's too cold, do the mix, wet out the cloth & then use a heat source to bump the mix so it sets. You can tent the area with some plastic & put in a small space heater to kick it off.