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In article ,
says...

In article . com,
"beaufortnc" wrote:

I'm prepping the bottom of my sailboat for barrier coat then ablative
bottom paint.

I'm thinking, however, that it might be a good idea to paint the prop
with something like Trinidad instead of ablative. It seems to me that
the ablative won't last long on the prop.

What's the conventional wisdom here?

I suspect something came up in the replies, but gave up when the thread
took a strange turn.

I've tried ablative, hard, "outboard" (TNT) and other options over the
years and have yet to find something that actually kept our prop clean
throughout the season.

I'm about to try something that scares the living dickens out of me, but
was recommended by the shop that installed our engine: NOTHING. No zinc,
no copper or tin-based paints. The theory is that the slight electrical
imbalance between the SS shaft and bronze prop will be sufficient to
keep both clean.

Since our shaft is isolated from everything else in the boat, the only
thing eating away half of our zincs each year is the SS/Bronze imbalance.

Put a donut zinc between the strut and the prop.