When our boat is hauled there is usually at least some barnacles on the propeller. The power wash used up close takes most of it off, and wet sanding eliminates the bits that are left.

we use clinging toilet bowl cleaner which is the same stuff at half the price. urea monohydrochloride

Vinegar will eat away at the metal. I specifically use it to clean corrosion off metal. That would worry me, especially if on a folding or feathering prop.

No accounting for Amazon reviews anymore. Vendors fluff their own stuff, competitors bash. It’s a polluted system, lots of documentaries on it. Not to mention the skill set of some users.

This is the product recommended and sold by PYI for the Max Prop. I’ve used it will great results.

I have no idea what’s in it, but I know there are acids that will quickly eat calcium before getting at any metal. I assume PYI would know the difference, but it is just an assumption. YMMV.

Good tip. I looked up the MSDS and see it has a few amines as well. No idea what they do.

I wonder, compared to vinegar, does it react more slowly with metal, or does it work so fast on the calcium you don’t need to leave it on long enough to worry about the metal.

Lets see, CH4N2O + HCL, can definitely see why it would work HCl is good at dissolving stuff.

The things I learn on Sailnet.....

I'm putting rubber gloves on my spring commissioning list.

There is no absolute need for harsh chemicals to remove barnies....this is what my prop looked like after letting it dry for a few days, scraping it with a painter’s 5 in 1, then hitting it with a wire brush in my drill and then an 80 grit flapper wheel. The epoxy barrier cost adheres very well to this surface.....

Attached Thumbnails

 

I get good results with an electric sander and never needed nor used a chemical. I usually only have a few of those critters when it's hauled out after a year

Attached Thumbnails

 

Antifouling paint, even the expensive stuff designed for props, doesn't seem to adhere well to props. Using an epoxy primer or barrier coat first seems to help the paint adhere better. I prefer Sea Hawk's Tuff Stuff; it sticks to anything. Just don't put any paint or barrier coat under your zincs.