Re: roll& tip painting a aluminum lapstreak boat
Try the different techniques out, roll and roll, roll and tip, brush and tip...spraying if you have the option. Personally used roll and tip on my boat, I tried roll and roll but technique didn't work for me. After doing my trailer I kinda like the brush and tip method now, seemed to be the one that flowed nicest for me. Practice on another surface before touching the boat, its a learned technique and even just a few feet of practice helps. Whatever ya do, if its been longer than about 3 minutes, don't try to fix a run, you do more harm than good. Easier to sand a nice straight run than to fix the ripple effect caused by brushing over curing paint.
These are just tips from my own experiences, they may or may not apply to you.