I leave my boats in a tidal estuary 24/7 usually from mid-May to October. I'm late getting my 12' skiff in this year, but that's besides the point ...
If you ever need effective anti-fouling bottom paint protection, especially for an aluminum boat, I am simply amazed at the results I got using the 'CFA' (copper-free ablative) from West Marine. The river I boat on is known for producing a heavy slime as well as barnacles and/or limpets, if a boat isn't used much or isn’t protected properly.
I surely don't use the little skiff as much as my other boats, but this bottom was the cleanest one of them all! In the picture attached all you can see is the 'waterline stain' from sitting in the water. There is literally ZERO growth with no barnacles or limpets attached ANYWHERE where there was any A-F paint applied. I'm really impressed with it!
I bought a gallon and it takes ~1/2" of paint to cover the 12-footer ... so that gallon will go far! And it's also on sale right now- at $150 per gallon, where it usually is $220. Ouch
- yes - but zowie - it sure works great!
FYI - The 'spots' you see on the hull are where I needed to replace a few rivets due solely to age ... but not as a failure of the paint ... at least under my ownership, lol!