Hot-caoting paint in cold weather

[Songololo]

My Wee Rob canoe is currently upside down and being coated with a polyurethane/alkyd resin based interior/exterior semi-gloss paint. The temperatures are 10C (50F) during the day, dropping to 0-5C (30-40F) overnight. Coats are taking 2 days to dry before they can be roughed with a Scotch before the next coat. The instructions on the can says to let dry and sand (scuff) between coats.

Am I asking for problems if I try to hot coat i.e. apply 2 coats per day?

[Canoez]

My Wee Rob canoe is currently upside down and being coated with a polyurethane/alkyd resin based interior/exterior semi-gloss paint. the temperatures are 10C () during the day, dropping to 0-5C overnight. Coats are taking 2 days to dry before they can be roughed with a Scotch before the next coat. The can says to let dry and sand (scuff) between coats.

Am I asking for problems if I try to hot coat i.e. apply 2 coats per day?

More than likely. Wrinkling and "alligator skin" are common if you rush things too much. Have some patience and let the coat cure properly and then do a good prep before applying the subsequent coats.

"Hot Coating" is a technique I've never heard applied to varnish/urethane coatings. I've used it for epoxies, but never for varnishes or urethanes.

Temperatures sound a bit low for doing what you're doing already - can you put it in a warmer space?