ORIGINAL: Dreamin Hemi
First of all, only use the masking tape for just that, masking..... To keep your lines straight and clean and sharp, use 3-M trim tape. It's not paper based but rather vinyl and in the 20 years or so I've been painting, have NEVER had a bleed-through. Edges will definately stay crisp if you use this stuff. Use the masking tape OVERLAPPING but pulled slightly back from the edge of your trim tape and use paper to cover what you dont want overspray on.
[link=https://www.hardwareworld.com/Fine-Line-Masking-Tape-18-inch-X-60-yards-pKZR16W.aspx]https://www.hardwareworld.com/Fine-Line-Masking-Tape-18-inch-X-60-yards-pKZR16W.aspx[/link]
[link=http://www.tcpglobal.com/3m/3m400-3.aspx]http://www.tcpglobal.com/3m/3m400-3.aspx[/link]
You can get this stuff at any NAPA or local paint jobber
Nice job on the boat!
Hemi mentioned the 3M vinyl fineline masking tape. It's the best.
I have learned how to make my masking jobs better with it. First and foremost with masking is taking care of your roll like it's gold. Don't drop it, ding the edges, pull off the roll hard, or pull on it to cut it. Treat it real fragile the whole time you own it, store it in a ziploc bag in a safe place by itself with nothing piled on it or in a bag of other rolls and before doing any masking make sure your bench is ultimately clean and covered with plastic and watch what your setting it down on when using it. A clean paper plate works good.
Most my masking problems such as bleed under or bad line all were caused from just not taking care of the new roll, keeping the sticky edges of it clean, and making sure I don't stretch it on the roll.
Primer and paint you have to be careful because sometimes paint doesn't stick to its primer very well because the primer went on dusty. Always be sure to scuff it down the best you can before paint. The thicker the primer, the softer the paint job will be when it's dry.