Can't speak for Falmouth, as my boat is in Poole. XM 3000 applied in april this year - yesterday had to have hauled out due to extreme barnacle fouling. They removed over 2 wheelbarrow loads! Have now applied Blakes, hoping for the best.
There's very little difference between most of the mainstream antifoul products - they're all basically cuprous oxide, sometimes with a bit of added biocide. Ones with higher specific gravity tend to have more cuprous oxide (you can often find SG listed on the data sheets on the makers' websites). Whichever you choose, the key to success is to get a thick enough layer on the boat. I use International Micron and I'm very happy with its performance.
TBTO is used commercially/industrially and is still available. A thick (viscous) abradable AF "thinned" with 2~5% TBTO is ideal /forums/images/graemlins/ooo.gif (IMHO) /forums/images/graemlins/grin.gif
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"Artificial intelligence is no match for natural stupidity" sailroom <span style="color:red">The place to auction your previously loved boatie bits</span>
No antifouling is perfect everywhere - and they're all trying to hit a moving target as the intensity and type of fouling in any area is constantly changing. Having said that there are "hotspots" for fouling types in different parts of the world. (East coast is generally high in barnacles for instance).
Almost all the antifoulings you buy as a tin of paint are based on copper oxide with added biocides. You get what you pay for in quantity of copper and quality of biocide package but even then it is only the case that the higher priced products have a better chance of working than lower priced ones.
If the barnacles decide to go for your boat there is very little that will stop them!
TBTO works superbly - but it has been banned from sale as an antifoulant for 20 years now. There are still high concentrations around some marinas and estuaries causing long term environmental problems. Arsenic also works superbly but not many of us would add it!
Big ships use exactly the same active ingredients but with erosion rates tailored for speed and distance. Again they get what they pay for in quality.
No antifouling is magic and works everywhere, every year.
Alternative to traditional antifouling is long life based on copper metal - but that's where I declare an interest so PM me if you're interested.
Well mine is kept on the Helford, and I've only used the cheap XM cruising stuff... but, it hasn't done too badly with no barnacles or weed growing yet, considering it is tidal and dries out isn't too bad either.
I'm moored in Portland Harbour Last year the boatyard supplied this http://www.ybw.com/ybw/seajet/products.html On the winter haul out I was very impressed. This year due to a substantial price increase he switched to Blakes. If its not worked as well as shogun 33 I wil happily pay the extra to revert back to it.