Propspeed Foulfree transducer protection, first impressions

When Ben Stein wrote about the new Foulfree transducer “paint” last November, I wondered how much coverage came out of that little $35 tube. I can answer that question now. In the scene above, I’m about to apply Foulfree to six transducers — the two loose and four already fixed to Gizmo’s bottom — and to my amazement, I only used about a third of the tube. So if the stuff really works, the one kit will protect a ducer-intensive boat for three seasons (though I’ll have to supply my own brush and surface prep tools next time).

I also found the process easy, as the silicone polymer seems enthusiastic about flowing into the recommended thin coat and I wasn’t worried about toxic substances. Of course, I won’t know how well it works for at least several months (and maybe a DIY hookah dive), but I’m sure hoping for better performance than what I’ve experienced from that old bottle of MDR transducer paint (that’s still kicking around my bottom maintenance locker).

I’m also hoping that the Foulfree will do better than the water-based and copper-free Pettit Hydrocoat Eco I’ve often used, and I’m already comforted by Airmar’s endorsement that Foulfree won’t negatively affect sonar performance. But I was happy to again apply some remaining Hydrocoat Eco over the inexpensive and easy-to-apply Pettit Prop Coat Barnacle Barrier I’ve long used to protect Gizmo’s bronze prop and stainless rudder. (I’ve learned over the years, though, that anti-fouling effectiveness has to do with a boat’s shape, how it’s used, and the microclimate of its home harbor as well as the coatings used; so results may differ.)

Finally, this was the first time I worked on Gizmo’s bottom in a windowless shed with a concrete floor, and I came to deeply appreciate the two accessories shown above. That Craftsman 9000-Lumen LED Work Light had already brightly lit the boat’s interior for many project sessions before illuminating bottom and topside details to a degree I hope few will notice now that Gizmo is at her mooring (my work is not up to what Wayfarer Cove did in 2018).

Then there’s that $11 Harbor Freight dolly with a large chunk of borrowed boat blocking on top. It was perfect for scuttling around the boat’s less accessible bottom areas, and your knees, back and shoulders may be equally grateful.

Similar Posts:


Foulfree from Propspeed, clean transducers without biocide
November 13, 2019

Eco bottom paint testing, back to copper and Irgarol
April 23, 2018

Gizmo 2016, Pettit Hydrocoat Eco round 2 and Gadget redo
June 28, 2016

Gizmo’s Ocean Armor topsides & Pettit Hydrocoat Eco bottom, the testing begins
May 24, 2014



Ben Ellison

Ben Ellison

Panbo editor, publisher & chief bottlewasher from 4/2005 until 8/2018, and now excited to have Ben Stein as very able publisher, webmaster, and editing colleague. Panbo is going to the next level in 2019 and beyond.

3 Responses

  1. Xavier says:

    We use a can of Penaten Cream (18% Zinc Oxide) diaper rash ointment we bought for $6.50 in 2014. More than 3/4ths of the cream is still in the can.

    Keeps the transducers clean for about 6 months.

    https://drugsdetails.com/penaten-cream/

    • Ben Ellison Ben Ellison says:

      Purportedly also good for taking the itch out of fresh sailor tattoos and many other uses! Zinc Oxide sunblock creams don’t seem have the same high percentage, but it also seems possible to blend your own coating: (maybe with waterproof grease?):

      https://www.makeyourown.buzz/zinc-oxide/

      Then again, that Pettit Prop Coat I use — which “contains highest amount of pure Zinc” — is not recommended for transducers:

      https://pettitpaint.com/media/4449/prop-coat-barnacle-barrier-product-data-sheet.pdf

      • Xavier says:

        Well, I have this plastic N2K speed/depth/temp DST800 transducer. I am on the third one since early 2013. I am pretty sure the original one failed before I started applying Penaten in late 2014, and it got replaced under warranty.

        The second one failed in 2017.

        On the third one, the temp sensor was the 1st thing to fail, as these always do so far. Temp failed in late 2018. I wonder how much longer does it have before it goes.

        The other transducer is much larger, a ForwardScan. Installed in 2015, it hasn’t yet failed, despite the use of zinc oxide.

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