How to on the Olson 30
Burnish a Vinylester Bottom, like Baltoplate or VC-17
The wool and the burnishing should only be done in Fore/Aft motion.
The idea that you only need to polish the first 6 feet of hull and forward 1/3 of the keel because of Reynolds numbers - is an old wives tale. It is based on drag models scaled up from hull testing in drag tanks. Turns out that Reynolds numbers don’t scale that way - especially in ‘surface boundary’ environments.
We found on the J-24, that going to 1600 grit (on a vinylester epoxy bottom) for the whole keel and rudder, and the forward 2/3 of the boat, made a noticeable difference.