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I have just hauled my boat to re-do the anti-fouling and anodes. I have had the bottom water blasted to remove the built up weed and coral that has accumulated since last anti-foul ( approx 16 months ago.)
The anti-foul has not lasted well and there are a number of patches on the hull where the paint has disappeared, and  a thick build up of marine life has occured on these spots.
My shipwright claims that the epoxy barrier coat has not been "keyed" and that the anti-foul is not bonding properly to the epoxy and falling off.
He is proposing that sanding the hull will not cure the issue, and that I should spend some $1500 to have the hull sand-blasted to form a keyed surface.
When I hauled the boat 4 months ago to have it surveyed, the anti-foul coverage was thinning but consistent. There were no bare spots at that time.
Does this suggestion sound reasonable? Does a good sanding normally provide a key for the anti-foul? What experiences have other owners had with paint bonding to the barrier coat?
Your advise and experiences will be gratefully appreciated.

Willie, I too have recently installed an S1 auto pilot on my Mk11. I notice that you have installed a strop to limit the arc through which your rudder swings. How many degrees either side of dead ahead does your strop allow? How did you set the Auto Pilot limits to ensure that it does not reach the limit of the strop? I've stripped the gears twice on mine in the first month ( Raymarine repaired under warranty) and I'm trying to eliminate every possibility.
Happy sailing!