Actually I don't know if you can apply it with a roller but i figgured if you can apply it with a brush you could apply it with a roller just like regular paint. Maybe I will call them Monday just to be sure.
dill27241, I have a '69 Flattop like yours but with a 160 hp Mercruiser I/O. Unfortunately someone painted the deck a very ugly battleship gray. I was thinking to take off the aluminum railings, possibly polish them up a bit, repaint deck white like you did, and then replace the railings. But I was wondering if you could give me any enlightenment as to how the railings are anchored? They almost look like bolts but how would one get to the bolt head down underneath the deck? Or are the bolts fiberglassed in and just the nuts are then just tightened down?