Naive antifoul question?

[brownsox]

Last year was our first full season. Boat is a trailer sailer - in water June to October last year, east coast. Not much weed, mostly only where the surveyor had scraped the hull. A bit round the water line after it had been left on a mooring. This year we're off to France and will leave boat over winter ... hopefully ashore.
The hull is a bit grubby but cleans up with Starbrite hull cleaner. Rub hand on it, blue colour comes off. Does that mean it's not hard antifouling? Do we need to redo it, or is it a case of leave well alone? If redo it, will a light sanding and recoat with soft af be ok or do you have to get the lot off? As a minimum we want to touch up the surveyor damage and redo the rudder, and the keel bulb which is a bit rusty. Any advice welcome.

 

[fireball]

The antifoul is probably self erroding .. ie, in time it won't be there.
We overwintered last winter, having put on a normal coat of AF in the spring and left it till this spring - no problem, a bit more fouling than I'd like, but it was all just slime and came of easily with a pressurewash (we did it between tides).
You don't have to take back all the AF to apply another coat, as long as it is similar stuff, I'd say you'd probably be alright with another Self Eroding one ... eventually there will be some build up and you'll have to scrape it all back or add a bigger engine!

 

[brownsox]

Thanks for that. Do we need to use primer, or just antifoul?