In previous two seasons, I've had Gentoo lifted on a crane long enough for me to slap on a coat of antifoul prior to launching. It was amazing how well the antifoul lasted and worked considering it was still wet when immersed. I would think you'll be OK for next year without any extra antifoul, but worth having Exodus lifted in the next season or two. Perhaps a job for the next time you visit a marina with a lifting facility. It only takes 30 mins to wash keel and repaint.
All the best,
Graeme,
P235 no 22 Gentoo