I had Aries IV's hull polished with Safe Boat Skin before it was launched, as I wasn't sure if it would stay in a marina or be dry-berthed. Now I am!
After six weeks, the fouling was such that it had to be high pressure hosed. It was lifted yesterday at Hamble Point Marina ("Summer Scrub" deal - very professionally done and lifted using its own strops, so no risk to the tubes).
There hull was severely "slimed" and the barnacles were there to stay.
The slime was hosed off and I immediately got back 7 knots. There is probably another 7 knots to be obtained, once I can get the barnacles removed as well. Fortunately, my boat will be lifted again in 2-3 weeks, to be epoxied and antifouled, so thousands of the little critters will be made homeless!
The point of my posting is to say that if you are thinking of trying this as an alternative to antifouling, I would strongly advise you to THINK AGAIN!
I shall post some pictures shortly, which I think you will find are pretty conclusive.
One good point about this product ... As a hull polish, it's great! The part of the hull that is above the water is really shiney.