Hempel Calculator - Silic One specifically

[Tzu]

After a lot of research I'm sold on the Silic One route for my boat, utilising a tie coat as my existing antifoul is in a decent condition. Hempels calculator tells me I need 1 x 2.5l + 3 x 750ml. My question - buying 3 of the small tins would cost about the same as one large tin, for slightly less paint. I cant see any reason not to buy two large ones? It should seal ok for when I do the patches under the pads?
Planning on doing this in March when hopefully I will get a weeks worth of decent weather in one go.

 

[superheat6k]

Closely follow the instructions and especially the complicated application rules for variations in temperature and time between coats and it will work very well. For the top coats using two different colours makes this far simpler. Useless on props.

 

[scozzy]

Coverage calculators are obviously useful but also...well...a good guide if nothing else I suppose!


Preparation
Condition of existing surface
Ambient temperature
Application method

All these and more affect how far you'll get and like wallpaper...you always want to gave a bit extra!
Not like you won't/cant use the excess.

Long story short,always have more than enough

 

[Neeves]

If you apply a silicone coating and find, for whatever reason, that it does not suit (commonly - does not live up to the hype) then removing a silicone coating is difficult - and you cannot leave it and overpaint as nothing else will stick.

Use the Forum search function and you will find many have tried a silicone coating and reverted to conventional.

Jonathan

 

[Sandy]

As long as you have an average speed of >10 knots for 23 out of 24 hours per day it works. If not you might be disappointed.

One chap in the marina a few years back after an Atlantic circuit could not get it off the boat fast enough.

 

[Chiara’s slave]

As long as you have an average speed of >10 knots for 23 out of 24 hours per day it works. If not you might be disappointed.

One chap in the marina a few years back after an Atlantic circuit could not get it off the boat fast enough.

Me too. I bought a boat with it on. It was fine the first year, and would still be fine if I could have jet washed it weekly. But the spores got into it, and weed grew back in the 1st week after launch in spring. But a regularly used planing hull should be ok for it.

 

[Neeves]

Its been tried, silicone coatings - on commercial vessels, cruise ships + others, they are effectively used continuously and will travel at well in excess of 10 knots - many have reverted to conventional AF.

Maersk use Jotun's Sea Quantum (which comes in at least 4 forms, for ships laid up and speeds of upto 20+ knots). Conventional AF but for professional use only.

Jonathan

 

[mrming]

I have seen both poor results and a very difficult removal process with Silic One on a displacement racing yacht. I would not recommend it for any non planing vessel.

 

[westernman]

If you apply a silicone coating and find, for whatever reason, that it does not suit (commonly - does not live up to the hype) then removing a silicone coating is difficult - and you cannot leave it and overpaint as nothing else will stick.

Use the Forum search function and you will find many have tried a silicone coating and reverted to conventional.

Jonathan

So it is very effective for anti-fouling??

 

[AntarcticPilot]

So it is very effective for anti-fouling??

Only if the vessel travels above a minimum speed the majority of the time - as a cargo vessel does. The principle is that organisms that settle cannot adhere quickly, and are washed off. But if the vessel is stationary, organisms can settle and develop anchor systems, which defeats the antifoul.

Basically, only suitable for vessels that are in use most of the time, or that are taken out of the water when not in intensive use. The speeds involved are also too high to be sustainable by most sailing vessels.