I have been snakebit, crashed motorcycles, and fallen 30 feet off a shale rock wall onto a cactus, but none of it ever aches like your knees on the third day of boat paint. Under the hot shop lamps where time stops.
You can't give up because you love your boat. Punch-drunk and high on naphthalene, you stay in there. No defense, all heart.
Paint is better than you are. More tenacious for sure. It will ripple if it wants to. If you try to cheat and smooth it out, it will gum. So you can't daydream. You know only the sheen where you've been and the matte where you're headed. Suddenly you've applied the last stroke and you collapse onto the cement. And for the first time that day you realize there's a gentle mountain breeze.