Very good claims are made for this system - so good, in fact that I decided to get my keels done this way. Turns out, however, that my nearest franchisee no longer uses the specified volcanic ash as, apparently, there is a known cancer risk involved in its use. Apparently.
Ended up getting them slurry blasted instead.
HOWEVER, you might like to look at soda-blasting as an alternative. Similar principles, similar claims.
I called Paul to strip my boat and he tried to talk me out of it as I was going to apply Coppercoat when it was too cold. I took some persuading but he really didn't want to take my money if I was going to end up unhappy.
Thus I recommend him as honest and honourable even tough he hasn't done any work for me yet! I've seen boats he's done and I will call him in spring without hesitation.
I have a wooden boat, It is a 50foot ex MFV. The first year we had her,we got Farrows in to blast clean the bottom back to the wood, they guaranteed to be able to achieve a clean bottom. The result was 80% clean, damage to surface of wood in many places but worse was the fact that it had blasted out at least 50% of the seam paying. They left the yard without clearing up, a total mess and a disaster. I would not reccomend the system on a wooden boat!.
Farrow system has shut down operations in this country and have moved to America. Apparently they lost a big Law suit with the MOD and The owner got divorced.
I have seen it, but wouldnt reccomend it for a carvel seamed boat, as it will remove the stopping. Depends on the operator I guess. But would use it on my boat, as we are splined and cascover sheathed. Would the symblast work on mine?? I wonder.