I was recommended Jotun Vinyguard Silvergrey 8 as an alternative to International Primocon when I stripped my hull last winter. The best price I could find for Primocon was about £60 for 2.5litres. Vinyguard doesn't appear to be available anywhere locally, but I found it on line for about £40 for 5litres delivered. I bought it from Rawlingspaints.com and it was delivered next day. It rolled on easily and overpainted well with antifoul. I can't comment on long term use as it only went on last winter, but various reviews I have read rate it highly.