Last summer I tried using Desitin to keep growth off the prop. It worked ok for about half the season but there was still some barnacles
and was stinky and a pain to apply. It can be reapplied in the water
, but that's an even bigger pain. This summer I tried using cold galvanizing compound from Home Depot for about $6.
Attached is a picture of the results after being in the water
from mid April to today. The boat
was pressure washed when it came out, but over the years, I've never seen them take any barnacles
off when they do it. And due to my marina being a basin with a 50 foot wide opening, I never trusted the marina got enough water turnover to be clean enough to swim in (rather I never trusted the other boaters not to direct discharge). That being said, I never got into the water throughout the season to clean the bottom, so the picture, for the most part, is the growth for the entire season. It's really only the beginning stages of barnacle growth, the stage that's easy to scrape off.
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