Fireboat Mast
The paint line should be straight, not curved up at the front, if you want to be as per real boat, its a swine to do, take the mark from the rear using some sort of home made scriber on a block at set height, make sure boat is level, or at least the correct attitude, and then you have a continuous straight line, going over the spray rails is very difficult. I used masking tape and just kept changing till I was satisfied it was straight, if boat is in primer, weigh it up to running trim weight, with weight displaced in the right place, and put it in the water, you will then get a wet line, and can compare with your drawn line, the white waterline is just that, water height, I cheated a bit so some of the red was visible to make the boat more attractive! 😀