I had a problem with barnacle and slime growth last year on my outdrive (even though I was running it once a week or more). There are several paints on the market that are okay for painting aluminum, and I'm trying to figure out which one will work best for our area. I get a little green slime and lettuce, but I think it's the barnacles that slowed me down the most. I'm convinced it cost me 1-2 knots by the end of the summer and made the engine work harder. Any thoughts/suggestions on good outdrive paints and prep appreciated.