roaches and waterbugs are same same same whether big red b-52s or lil brown german omg yer done now nasties, or what ever varietal of the day you found, they are roaches. guess what--you gotta tent to rid self of all of em. sad to say. they adapt and you never get them out of your boat unless you sink and refloat , tent,or burn it to water line. seems to me the easiest is to tent it.
oh,and the magic stuff is borax. but you will still have em despite this ..or any other stuff until you sink, burn, or tent your boat.
botic acid powder works like majic. I tried everything until I used boric acid without success