Salt water or estuarine (mixed fresh/salt), for sure. More than a few weeks and you will get 'hard' (barnacles, mussels, etc.) growth starting on a hull without anti-fouling. In fresh water lakes out west I have not seen it to be necessary. This includes in warmer lakes than Dillon that also have more micro-life in them. Some slime layer may form over months, but it scrubs or pressure-washes off pretty easily. I have personal experience with Klamath Lake - home of MLM blue-green algae, a very soupy lake, shallow and relatively warm thru the summer - where the Ensenada 20 I had years ago lived in the water all season. Some slime layer but nothing more. Also with marinas at Fern Ridge Reservoir near Eugene, OR which are full of boats all season. That's another relatively shallow, relatively warm in summer, murky lake. Vast majority of boats I've seen there have no anti-fouling paint. They get a slime layer to some degree that scrubs off pretty easy. My M17 was in Siltcoos lake near Florence, OR for a month last year - also a relatively shallow, warmer in summer, somewhat murky lake. The in-water parts got a little slimy to the touch is all. Also, my varnish over CPES mahogany rudder had its working end in the water that whole month with no damage to the finish. EXCEPTIONS to the above re anti-fouling paint and fresh water would be where there is 'hard' aquatic life in the fresh water. One example I know of is Lake Champlain, which has fresh water mussels. cheers, John On 9/22/21 7:16 AM, Dave Scobie wrote:
Andrei:
A few rare locations one can keep.biata in-water for extended periods without antifouling paint. Lake Dillon Colorado being one I have personal experience. See discussion -
https://m17-375.com/2019/02/03/antifouling-bottom-paint-selecting-bottom-pai...
Again varnish cannot be used for under water applications. A few hours or day is okay, followed by a drying out period, but longer the finish will fail.
:: Dave Scobie :: M6'8" #650 :: Baba 30 #233 DEJA VU :: SV SWALLOW - sv-swallow.com :: former owner M17 #375 SWEET PEA - m17-375.com :: former owner M15 #288 SCRED - m15namedscred.wordpress.com <<-- new site!
On Mon, Sep 20, 2021, 6:06 PM Andrei via montgomery_boats < montgomery_boats@mailman.xmission.com> wrote:
Hi Dave,
As you are keeping the boat in-water did extended periods what antifouling are you using on the hull and centerboard?
I haven't used anything, and so far (perhaps since the water is very clean and rather cold) it seems to have worked great. There is only a thin layer of slime on the boat, and I hope when I pull it out in about a month to clean it with a solid washing/rag/maybe light power washing.
Should I be using an antifouling paint in order to **protect** the hull and centerboard? Do you recommend I use the same product to coat the rudder too? Should I put a layer of glass on top as well?
Thanks, Andrei.
On Mon, Sep 20, 2021, 6:06 PM Andrei via montgomery_boats < montgomery_boats@mailman.xmission.com> wrote:
Hi Dave,
As you are keeping the boat in-water did extended periods what antifouling are you using on the hull and centerboard?
I haven't used anything, and so far (perhaps since the water is very clean and rather cold) it seems to have worked great. There is only a thin layer of slime on the boat, and I hope when I pull it out in about a month to clean it with a solid washing/rag/maybe light power washing.
Should I be using an antifouling paint in order to **protect** the hull and centerboard? Do you recommend I use the same product to coat the rudder too? Should I put a layer of glass on top as well?
Thanks, Andrei.
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com