Here the thing automotive Paint will not stay on the top deck of your boat!
you can put it on and it will stay for maybe a year or so. when it start lifting you will have to strip it all off. Yes some company used automotive to paint stripes ect. the other thing is you kill the resale and Quality of you boat. how many bass boats come with automotive paint on them? this is just my opinion. I have and do warranty work for all major brands of bass boats and also alum boats so I use 2 part paint on alum not Fiberglass. Not trying to be a smart ass by no means.