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Old 04-07-2015, 04:23 PM   #21
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Originally Posted by BruceK View Post
Good decision,I wanted propspeed on props, shafts, and skegs, yard said it only works on things that move/spin. We left the skegs,which foul with barnacles despite coats of hard a/f. If you get a good result from zinc spray on the shoe, can you remember to post it, when you know.

PropSpeed works on rudders and struts. And SS of course.

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Old 07-02-2016, 02:48 PM   #22
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Just want to add that I used the HD/Rustoleum cold galvanizing spray and had marginal results. This is 6 months of exposure; Nov 2015 to end of April 2016 in SW FL and about 700 nm cruising at 6.8 kts.
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Old 07-02-2016, 03:45 PM   #23
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I recently checked my stainless keel shoe which was coated with a cheap zinc based cold galvanizing spray. It possibly may have slowed the fouling slightly, but still plenty of scraping required. Certainly no miracles.

I'll go with Prop Speed on the shoe next time when I redo the prop.
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Old 07-02-2016, 05:10 PM   #24
City: Melbourne, FL
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Originally Posted by dwhatty View Post
Does lead repel barnacles? The Pettit product has done well for our Northerly climate boat's prop. Dunno about lead. And which is worse for the environment?
High concentrates of heavy metals kill all invertebrates / crustaceans which is why many bottom paints use copper oxides...
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Old 07-02-2016, 09:17 PM   #25
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Copper alone doesn't do it. I have a wood boat with a copper plated bottom. I still have to paint.
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Old 07-06-2016, 05:14 AM   #26
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"I still have to paint."

Scrub clean more often and there is no need for paint on copper..

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