Trep, they just made diazanon a banned pesticide. No more will be produced just like DDT and Chloradane (termite treatment). Can you tell I used to own a Pest Control business (TOXIC again!!). Elk, first find out WHY they are in your boat. Ants don't eat carpet glue...cockroaches and termites might.....anyway, check for any leftover or forgotten food etc., then check to see if they are nesting in the boat or just passing through. Ants travel by scent left by the ones in front of them, thats why you get so many at once (and why they always travel in a single-file line. Your boat may just be in the middle of an ant highway. If so, either sprinkle moth flakes around on the ground by your boat (if you are a "non-toxic" proponant) or get some commercially avaliable insecticide specifically for ants. If they are nested in the boat (I would have to make a determination as to what species of ant to be sure if it is possible) then Trep is right, you will have to kill the nest. Only carpenter ants would have a reason to nest in the boat and that would be rotten wood, maybe you have bigger problems, LOL.
TOXIC