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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Outboard > Anti-Fouling Paint on an outboard?
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Topic Review (Newest First)
02-05-2014 07:59 PM
Brewgyver
Re: Anti-Fouling Paint on an outboard?

+1 on what PDQ said.

Yes, you can kill the critters that WILL grown in your cooling passages by running the engine hot enough for long enough. BUT, the dead critters will still be there, latched onto the metal, and the only way to get them out is acid washing - with an inhibited acid of course.

Talk to a local yard that does outboard work, and ask them.
02-04-2014 12:15 PM
newhaul
Re: Anti-Fouling Paint on an outboard?

[quote=dabnis;1377937]
Quote:

Seeing some outboards in the water all the time I have often wondered about the insides of the passages becoming plugged up? Doubtful that they could ever be un-plugged?



Paul T
Actually yes they can be unplugged if seawater based soak in fresh for 3 days and then flush if fresh based do the reverse works good for me also I run the engine once a week if left in the water to stop growth from getting a hold
02-04-2014 11:56 AM
dabnis
Re: Anti-Fouling Paint on an outboard?

[quote]
Quote:
Originally Posted by pdqaltair View Post
a. Unless you've figured out how to paint the inside of every passage you'll get growth inside. On inboards there are 2 differences; the passages are larger to allow for this; when the seacocks are closed there is no oxygen in the water and this tends to kill everything.
Seeing some outboards in the water all the time I have often wondered about the insides of the passages becoming plugged up? Doubtful that they could ever be un-plugged?

Quote:
b. If something grows in there, you might just need a new engine. And something will.

c. Try this expereinment. Wrap some duck tape on a couple of blades, not floppy but not skin tight. Feel the vibration and note the loss in speed. It doesn't take much on a high speed (relative to inboard props) prop to desroy the flow.

I really don't think you want to do this. I'm not sayin' you can't, I'm just sayin' you'll be worse off.
Paul T
02-04-2014 08:50 AM
Multihullgirl
Re: Anti-Fouling Paint on an outboard?

Quote:
Originally Posted by ericb760 View Post
I've been looking at anti-fouling paint in a spray can to paint the the lower so that I can leave it in the water and only pull it once a week to flush and rinse. Are there any downsides to doing this? I would start with a coat of self-etching zinc chromate primer followed by a couple of coats of the anti-fouling in a can.
On my saildrives, similar to your application:
Started with ZC, then coated with a Carboline epoxy product, then went over that with West Marine's paint-on. Everything but the really shitty WM antifoul is working just fine. I emphatically do not recommend West Marine's OB antifouling.

You say you're pulling it every week, so I suppose even if the antifoul is crappy, you'll have the opportunity to clean it off while it's out.

In retrospect, I wish I'd gone with Trilux. That, or I may really spend some time with the epoxy and go over that with the Trinidad PRO bottom paint that is working a treat, but I was hesitant in that Trinidad is copper and that's another argument for another thread
02-04-2014 07:56 AM
pdqaltair
Re: Anti-Fouling Paint on an outboard?

Quote:
Originally Posted by ericb760 View Post
Thanks, but I don't think it's really rocket science. I figure I'll sand the old and peeling paint off, hit with some aluminum primer, and then spray on the anti-foul.
a. Unless you've figured out how to paint the inside of every passage you'll get growth inside. On inboards there are 2 differences; the passages are larger to allow for this; when the seacocks are closed there is no oxygen in the water and this tends to kill everything.

b. If something grows in there, you might just need a new engine. And something will.

c. Try this expereinment. Wrap some duck tape on a couple of blades, not floppy but not skin tight. Feel the vibration and note the loss in speed. It doesn't take much on a high speed (relative to inboard props) prop to desroy the flow.

I really don't think you want to do this. I'm not sayin' you can't, I'm just sayin' you'll be worse off.
02-04-2014 02:37 AM
ericb760
Re: Anti-Fouling Paint on an outboard?

Quote:
Originally Posted by newhaul View Post
Why not pull the motor and store in the cabin locked up sounds like good idea and really cheap to
Looking forward to summer, I spend 3-4 nights a week on the boat, and it's not feasible to store it in the cabin on those nights. A friend suggested that I lay it down in the motor well but I don't know if it will fit that way. Plan to check that out this weekend...
02-04-2014 02:34 AM
ericb760
Re: Anti-Fouling Paint on an outboard?

Quote:
Originally Posted by FourthCoast View Post
ericb,

I am sorry I do not know exactly how the engine was prepped before the first coat of antifouling paint. The engine was put on by the previous owner. If you would really like a first hand account of priming and prepping I can try to contact him.

Scott.
Thanks, but I don't think it's really rocket science. I figure I'll sand the old and peeling paint off, hit with some aluminum primer, and then spray on the anti-foul.
02-03-2014 04:31 PM
newhaul
Re: Anti-Fouling Paint on an outboard?

Why not pull the motor and store in the cabin locked up sounds like good idea and really cheap to
02-03-2014 04:20 PM
FourthCoast
Re: Anti-Fouling Paint on an outboard?

ericb,

I am sorry I do not know exactly how the engine was prepped before the first coat of antifouling paint. The engine was put on by the previous owner. If you would really like a first hand account of priming and prepping I can try to contact him.

Scott.
02-01-2014 04:49 PM
Minnewaska
Re: Anti-Fouling Paint on an outboard?

Quote:
Originally Posted by ericb760 View Post
Unfortunately, on my Dolphin at least, there is no room in the motor well to tilt the motor out of the water without cutting a large chunk out of the bottom of the transom.
Understood. In a well, the mechanism would pull it straight up. That's why I suggested that would probably interfere with the cover hatch, but something else could be fashioned for when at the slip.
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