I have had a few arguments about using ancient antifouling. Here is the boat as she came out of the water after 12 months, the last 3 sitting in the marina. The paint was 10 year old ABC 3. Mostly soft growth.
I tried using Sharpie permanent marker on the prop after having rather mixed results from Propspeed. It was fine for the first 6 months even though I sand blasted the prop a few times running aground, but then gradually lost its effectiveness. I think it would be fine on a cat where you could sit on the sand every 6 months and refresh it.
This time I will use Velox on the prop. It has had some success on the Gold Coast where high salinity and warm shallow water plays havoc with antifouling. A bit easier to apply than Propspeed and cheaper, $250 would give you 4 uses on a 16 inch prop. The Gori is a fine prop but it is really hard to keep shell out of the gears. I load them up with grease and hope for the best. Anyone know of an effective way to deal with this?
I went for a dive and had a look at my Velox painted prop. Its been in the water for 2 1/2 months and it had tiny barnacles growing all over it. I brushed a few with my hand and they just fell off. Fingers crossed it will never have nothing but tiny barnacles on it.
The other day on TV I saw a clear spray there using on the inside of paint drums . What it did was no paint was left inside the drum it was like the tin the paint came in was never used clean as .
I wonder if that could be used every thing slips off it .
At the moment its used in commercial drums probably 60 lite . I just caught a glimpses of it on sunrise T.V. or some thing.
Looked like interesting stuff
Select to expand quoteHG02 said..
The other day on TV I saw a clear spray there using on the inside of paint drums . What it did was no paint was left inside the drum it was like the tin the paint came in was never used clean as .
I wonder if that could be used every thing slips off it .
At the moment its used in commercial drums probably 60 lite . I just caught a glimpses of it on sunrise T.V. or some thing.
Looked like interesting stuff
I used to run a factory that made paint tins and drums up to 200L There are lots of coatings for the insides, the one I think you may have seen is a hydrophobic coating...so it repels water based paints.
The downside of most of these coatings is they need curing, generally temps of 180+C or more for, 8 plus minutes, through big gas fired ovens. There are some very complex microwaves ovens that do it quicker.
I could see a Production boat factory using a coating initially...but all coatings leach out the actives over time..so back to normal anti foul.
I can vouch for the fact that Sharpies don't work. Fortnight for a nice covering of shell.
The future of antifouls is Silicone which will work on props just like teflon a frying pan.
By 2020 copper antifoul will be banned in most places 
