Cruisers & Sailing Forums (http://www.cruisersforum.com/forums/)
-   Construction, Maintenance & Refit (http://www.cruisersforum.com/forums/f55/)
-   -   Propeller antifoul (http://www.cruisersforum.com/forums/f55/propeller-antifoul-114325.html)

Chrisc 28-10-2013 21:55

Propeller antifoul
 
I am mulling over an idea for a propeller antifoul and would welcome feedback.

A while ago I messed up the mixing ratio of West System epoxy by adding a bit too much hardener. The resultant brew cured with good adhesion but remained slightly rubbery. The local West System supplier told me that it would remain a little soft and that the coating would slowly degrade over time.
I'm sure you can see where this is going.....

Why not mix in finely ground copper to an over-hardenered epoxy mix and apply it to a propeller? I have tried painting this mix (without the copper) onto stainless steel plate, and it sticks like poop to a blanket. A normal epoxy mix sets rock hard and can easily be chipped off, so I am assuming that if the mix remains slightly rubbery ie flexible then adhesion is enhanced. I presume that I would get the same result on a bronze prop.
The whole idea is based on money - I love PropSpeed but can't afford it.

Boracay 28-10-2013 22:59

Re: Propeller antifoul
 
It might work. I'd reckon that's what the developers of Propspeed did - just tried lots of ways and finally one worked.

My understanding is that Propspeed is a silicon based coating that works by being so smooth that no fouling critters can hold on when the prop starts spinning.

If I was desperate to try a prop antifouling that wouldn't work I'd get a tube of el cheapo silicon rubber, prepare the prop as well as possible and then apply the silicon as smoothly as possible.

ozskipper 28-10-2013 23:08

Re: Propeller antifoul
 
lanolin?

Skip to 6.06
Lanotec on ABC Landline (2001) - Part 2 - YouTube

fstbttms 29-10-2013 09:00

Re: Propeller antifoul
 
Quote:

Originally Posted by Chrisc (Post 1376982)
Why not mix in finely ground copper to an over-hardenered epoxy mix and apply it to a propeller?

Because the copper particles will be encapsulated in the epoxy matrix and have no transportation mechanism to reach the boundary layer between the prop surface and water (which is how anti fouling paint works.)

fstbttms 29-10-2013 09:03

Re: Propeller antifoul
 
Quote:

Originally Posted by Boracay (Post 1376992)
It might work. I'd reckon that's what the developers of Propspeed did - just tried lots of ways and finally one worked.

Except that the makers of PropSpeed had an understanding of what they were doing before they started. Also, PropSpeed works on a "foul-release" principle, meaning it creates a surface that is too slippery for fouling organisms to remain attached. It doesn't work by leaching toxins into the water, like traditional anti fouling paint.

Cheechako 29-10-2013 09:30

Re: Propeller antifoul
 
I read an article recently stating that antifouling on a prop doesnt work well because it is sacrificial to the bronze prop. It said you need to prime the prop before putting antifouling on.
I have tried lanolin, ....marginally effective. On my cat I tried a full can of silicone sprayed on one prop and lanolin on the other. The lanolin was more effective.
I had access to industrial teflon coating (like the fry pans) years ago. I had my prop done with that. It seemed to work very well, (baked on) but I was in the PNW where the fouling isnt so bad.

Chrisc 29-10-2013 23:12

Re: Propeller antifoul
 
Quote:

Originally Posted by fstbttms (Post 1377259)
Because the copper particles will be encapsulated in the epoxy matrix and have no transportation mechanism to reach the boundary layer between the prop surface and water (which is how anti fouling paint works.)

Yes, I did think that it would be necessary to sand the epoxy a little in order to expose the copper to the seawater.

westwinds 04-11-2013 12:43

Re: Propeller antifoul
 
Sex Wax, it is used on surfboards, but can be used on a propeller for barnacles

Artif 04-11-2013 13:01

Re: Propeller antifoul
 
TBS is selling this, Lanred, he stands by what he sells, and from experience of his other products and tools, he has always been right.
Glues, Tar & Pitch - Traditional Wooden Boat Supplies

SmartMove 04-11-2013 13:15

Quote:

Originally Posted by Boracay (Post 1376992)
My understanding is that Propspeed is a silicon based coating that works by being so smooth that no fouling critters can hold on when the prop starts spinning.

I can't speak to the physics of this, but I can tell you that we applied this to our prop a year ago and have had no critters adhered to the prop so far.

sailorboy1 04-11-2013 14:10

Re: Propeller antifoul
 
I've used the Petiat (sp?) zinc spray for 2 years and it has worked good and was pretty cheap ($16 a can that lasted 2 years)

hugosalt 04-11-2013 18:42

Re: Propeller antifoul
 
Have used Pettit Zinc Coat barrier 2 years running
on my flex o fold prop with disappointing results. (in western LI Sound) Will not use again. Will try to swing for PropSpeed next year.

pbiJim 04-11-2013 18:45

Re: Propeller antifoul
 
Has anyone ever tried plasma coat or silicone paint?

nolandan 07-11-2013 07:42

I might try copper-coat manufacturer base product in a silicone suspension. Their product is micro ground and since the product comes in a two part epoxy-solid you can make and easy calculation of how much you should use per ounce to get optimum coverage.


All times are GMT -7. The time now is 03:24.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.


ShowCase vBulletin Plugins by Drive Thru Online, Inc.