Doug King wrote:

Barnacles won't grow on a prop that gets run every week or so.

If the prop is run up to speed every week, then you will
see only small barnacles around the hub pretty much indefinitely. Try
it.

I disagree, Doug. In Long Island Sound, I see significant barnacle
growth all over props at the end of each season, even when they are run
frequently - more than twice a week. This year the yard painted all the
props in the yard with the same type bottom paint the racers use on
their bottoms(without the wetsanding)- a hard, epoxy-like paint and
there was no, or nearly no gowth so far on the ones I observed just back
on the hard.
A while back I met a guy that said he only uses Lanolin on his prop with
(he says) very good results, but I cannot personally verify that. He
did say that he applies it by hand several times a season, and that he
does it with the boat in the water.
FWIW, Interlux has just started marketing a spray-can prop paint they
describe as a hard coating like the racers use on the hull bottom.
Red