Join Date: Sep 2006
Thanked 4 Times in 4 Posts
Rep Power: 10
Just did mine this spring (26 footer). One gallon was good for two coats.
Surface prep was with 80 grit on a hand held 5" random orbital sander.
How often depends on the type of anti-fouling paint you use and the water conditions where she is sailed/stored.
I used a hard multi-year paint for trailerable boats. This applied over a two-part epoxy barrier coat.
All this assumes the hull does not have any blister problems.
`99 Beneteau Oceanis 352, #282 WiTCHCRAFT
Sailing Lake Michigan and the Great Lakes