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Old 21-06-2022, 16:45   #1
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Coopercoat, what to put on the saildrives?

Put Coopercoat on my Lavezzi.
What to put on the Alu-saildrive Volvo 130S?
To risky to put Coopercoat…even when you put epoxy on you always have a problem at the joints.
I got recommended Belox and Silk one but both are soft antifouling where the last Layer is basically pure silicone which has no mechanical strength. Not a friend of them at all.
Would prefer hard antifouling where they recommend trilux.

Any advice or recommendations?
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Old 21-06-2022, 20:25   #2
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Re: Coopercoat, what to put on the saildrives?

Propspeed
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Old 22-06-2022, 00:24   #3
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Re: Coopercoat, what to put on the saildrives?

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Propspeed
Propspeed is also soft antifouling, last layer is basically pure silicon. Its very good but very fragile. Eg accidentally hitting it with the scotcnbrit when i clean the Coppercoat under water will already destroy the surface.
Can I hold myself on the Propspeed coated saildrive with one hand and cleaning the prop with the other without destroying the surface?
On the new Flexofold goes nothing, as they recommend. Also need to be able to keep them stock so i can exchange if they don't fit.
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Old 22-06-2022, 00:45   #4
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Re: Coopercoat, what to put on the saildrives?

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Originally Posted by CaptainRivet View Post
Propspeed is also soft antifouling, last layer is basically pure silicon. Its very good but very fragile. Eg accidentally hitting it with the scotcnbrit when i clean the Coppercoat under water will already destroy the surface.
Can I hold myself on the Propspeed coated saildrive with one hand and cleaning the prop with the other without destroying the surface?
On the new Flexofold goes nothing, as they recommend. Also need to be able to keep them stock so i can exchange if they don't fit.
And here was me believing that propspeed was a foul release product, not an antifoul, silly me.
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Old 22-06-2022, 01:36   #5
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Re: Coopercoat, what to put on the saildrives?

Powder coated paint and wax. Thick bottom paint will not stick and will cause heating problems. Anti algicide wax.
Do you put bottom paint on an outboard, or a sterndrive !!!????
It’s been a tough thread to read
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Old 22-06-2022, 02:32   #6
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Re: Coopercoat, what to put on the saildrives?

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Powder coated paint and wax. Thick bottom paint will not stick and will cause heating problems. Anti algicide wax.
Do you put bottom paint on an outboard, or a sterndrive !!!????
It’s been a tough thread to read
Trilux (my preference at the moment) worked for years without problem. If someone know anything better, open for suggestions. Coopercoat and saildrives serviceable from above so only haul out only for saildrive antifouling or if problems... So antifouling should last as long as possible.

and no antifouling properly applied will be so thick that it influences saildrive cooling. We are talking here about 200 to 400 mikrons, not even half a millimeter thickness.

Coeld get propspeed cheap, my hard neighbor has some left from coating his saildrive.
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Old 22-06-2022, 04:04   #7
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Re: Coopercoat, what to put on the saildrives?

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Do you put bottom paint on…. a sterndrive !!!????
Yes. That is SOP
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Old 22-06-2022, 04:07   #8
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Re: Coopercoat, what to put on the saildrives?

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Propspeed is also soft antifouling, last layer is basically pure silicon. .

There is no hard paint that you can apply to aluminum without first coating the aluminum with epoxy. That is the nature of the beast.
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Old 22-06-2022, 05:03   #9
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Re: Coopercoat, what to put on the saildrives?

Cast aluminum you can do a lame version of anodizing but yup takes an alkaline wash they Oxide primer to bite.
Yanmar and I disagree with adding paint.
Paint a ZF SeaRex other power boaters will toss you from the club. Take the copper roller to a V12 Merc they face slap will be heard world wide. Ask ZF they are nice folks make transmissions for BMW and Corvette
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Old 22-06-2022, 05:28   #10
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Re: Coopercoat, what to put on the saildrives?

I guess being a Great Lakes boater I’m spoiled. Every fall and spring we have an opportunity to make our bottoms perfect.
I never used anything but speed wax on high performance boats. My Jeanneau came with bottom paint I’ve maintained. I don’t have a SeaDrive. No paint on my shaft and wax on the rudders.
I do have a boat with an old Merc Speedmaster II. Had to come down to bare aluminum on rebuild. New fin stuff.
Alkaline wash two coats of green oxide wet sanded 2 coats base black Epoxy 5 coats clear top coat. At the 64-70 mph the Donzi moves at the clear coat wears and is kept up. And wax the anti algicide stuff from Aurora.
Salt water starts to bite paint. Some diluted drain cleaner will wash away aluminum oxidized from the paint then follow ZF instructions to restore salt water barrier.
That’s what mercury and Yamaha say also.
Evinrude with all their colours had touch up kits. So did Johnston
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Old 22-06-2022, 05:40   #11
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Re: Coopercoat, what to put on the saildrives?

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I guess being a Great Lakes boater I’m spoiled.
Gotta love when a freshwater boater comes in here and tells saltwater sailors that they don't know what they're doing, anti fouling-wise
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Old 22-06-2022, 06:08   #12
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Re: Coopercoat, what to put on the saildrives?

I caught my Dentist pretending to be a diesel mechanic. Made my day.
Now I always ask him about engine stuff and call Yanmar for my teeth.
I think we are talking about ways to avoid maintenance. Yes apply a quarter inch of goo on everything and wait for the surprise.
There are at least a dozen Jeanneau on the hard being sold off by fleets. Photos parked on the hard cold yard. All have sail drives I think 20’s and factory paint. Not one has roller goo. This is because they staff have been trained by the factories.
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Old 22-06-2022, 06:22   #13
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Re: Coopercoat, what to put on the saildrives?

Around here, bottom of Aus, the go to is still Trilux for aluminium I think...
What about Altex Pettit Vivid? Any users? They make some claims about multi season...
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Old 22-06-2022, 13:13   #14
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Re: Coopercoat, what to put on the saildrives?

Don't know if it's a possible where you keep the boat but
Where I am in the sth,,if I'm leaving the boat sitting for
More than a couple of weeks,,I go over the side and tie
Black garbage bags over the props and sail drives,,,I've
Left the boat like this for up to 4 months,,Voila !! No
Growth ,,NO Electrolysis. ..
Of course,,there was that one time with the Gator ,but
That's another story....
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Old 22-06-2022, 16:51   #15
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Re: Coopercoat, what to put on the saildrives?

I put Coppercoat on my Yanmar saildrives for years. Just put on a clear coat of epoxy, then the CC. Never had any problems and, like the bottom, it is nice to be able to use steel scraper & steel wool to clean. It doesn’t seem to last as long as my bottom CC which is about 8 years old now. Live permanently in the tropics. Evan on JAVA
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