Planning on painting my bilge area with Awlgrip. Would like to brush it on while using the brush on additive. Curious as to how this will work on the vertical surfaces of the bilge. Will the brushing additive cause the paint to run. Any help is appreciated.

I would say roll in on,,,,,and use the brush for the corners the roller wont reach, or to cut in around things your not removing

you can do that...works fine, but you can use rustoleum works just as well holds up great and way less $$$$$