I also have thought about tarping off the project site with tarps or visqueen, but worred about unattended heat sources overnight.
You are right about making sure you're not melting the boat. In late fall when temps were iffy, I was heating a small repair on a thermoform boat with a basis shop lamp. Thought the head from the bulb would give me just what I needed for some sustained heat. The edge of my work lamp was too close to the deck and I melted a dime size divot near the day hatch. Oops. Might have caused the hatch rim to sag a bit, but it's not realiy noticable.
Classic Freestanding Rack
Sport Cases (Electronics)
Electric Kayak Motor
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