I agree. There are many yards around using the farrow system for antifoul removal. It's a combination of high pressure water with some kind of grit medium in there. The medium and water pressure can be altered to suit the actual hull material. If it's done well there will be very little evidence on the Gel coat (if it is Gel).
had my boat soda blasted, the results were great, seen the farrow system and the end results of that, id reccomend soda blast over the farrow grit system.
I used this pasty stuff, think it was called "Dilunet", just painted it on, left it about 2-3 hours and then pressure washed it off and it worked a treat!
2 tubs did my old Ring 21 and it was about £15 a tub...