I used Sea Guardian for three years until I could no longer get it from my usual source. This place decanted it from 25ltr drums into five litre drums. They can no longer do this as it contravenes EU regulations. Bloody EU again!! It was very good with good properties, as it was used by containerships (at least by the company I worked for) until they found it ablated too quickly. They went back to TBT antifouling. No fault with the product on sailing boats though.
BTY, Sea Guardian, to comply with the ONE STATE EUROPE, is now called by another name, though I have lost the bit of paper with the new name on it.
As a result, I used XM HS3000 last year with (surprisingly, after all the adverse comments about the 2000 product) good results. Only slime on the hull with a few barnacles around the unpainted porp/cutter/shaft area.
I bought Super Tropic thinking it was similar to Sea Guardian - self ablating - but, at the boat show, was told that it is not self ablating - it builds up and eventually has to be scraped away. The boat yard are now going to use it on their work boat.
So what am I going to put on this year?? I have an old tin of AwlGrip Gold Star to be used up, so it is going on this year - unless a few of us can get together and get a 25 ltr drum of Sea Guardian and decant it ourselves into 5 ltr cans. There is an trade outlet for Jotun at Penryn, Cornwall.
I also use this...it is easy to apply and was put on to it by local fisher folk - the crowning glory is that it is very cheap if you buy at Trago Mills
I spoke to Jotun at the London Boat Show and they told me that Sea Guardian is 100% legal. You can still buy it too, there's a company in Hull which sells it in brand new 2 gl cans.
As to it's effectiveness, I just pulled my boat, light sanded and gave her another two coats of the stuff - first time out of the water in two years and not a single barnacle on her bottom.