It'll be OK. It's not the most powerful antifouling, but it should work for a season without problems. It has only 45% solids, compared with 60% solids for Micron Extra, but then it's a lot cheaper than Micron. Gael Force are currently offering it at £27.99 per 2.5 litre tin, so even with their £6.99 delivery charge it could be worth a try.
Don't know whether Bottomcoat would be better than XM Cruising. The XM is routinely available at about £30, whereas Bottomcoat is normally about £40. They're both basically cuprous oxide antifoulings. You do realise that XM Cruising is an eroding antifouling whereas Bottomcoat is a hard antifouling?
"You do realise that XM Cruising is an eroding antifouling whereas Bottomcoat is a hard antifouling?"
No, I missed that. I assumed Bottomcoat was similar because its not listed as suitable for high speed craft. When you say "eroding" is that the same as International's term "self polishing"? I need to check out what we used last year, branded "Nautical". That stuff wasn't very good, but this year's paint will need to be compatible. I guess I could apply eroding over hard, but not vice-versa.
Yes, "eroding" is the same as "self polishing". One benefit of eroding antifouling for low-speed craft is the absence of a build-up of antifouling over the years.
I found Flag Paints antifouling works really well in the Thames Estuary. Its made by a company based at Burnham on Crouch so they know the local waters. I've tried others and nothing compares to it around here.
I emailed International and said their website claims in different places that Bottomcoat is both eroding and hard. International have confirmed it's an eroding antifouling. I imagine they'll be correcting the website in due course.