[Milsurplus] cathodic hull protection

[Boeing377]

"I don't know about the sea critters.  Cathodic protection is very
important to pipelines, piers, building foundations, etc, anything
metallic in contact with soil or water. "

I've used CAPAC systems on ocean going vessels and never seen them have any noticeable effects on barnacles and other critters that like to add drag to your prop and hull. The impressed current cathodic protection systems can eliminate the use of sacrificial metal anodes such as ones made of zinc.

Toxic bottom paint is still the only effective remedy to keep hulls from fouling with marine organisms. Civilians have to use less effective copper oxide antifouling paint compounds.  The feds can use anything they want, like tri-butyltin, TBT which works GREAT but creates problems as it ablates and enters the ecosystem.
If I use what the US Navy uses I am committing a felony. 

Ultrasonic energy has been touted as an antifouling solution, but I have had barnacles grow all over my sonar transducers so I am a skeptic.

What does this have to do with mil surplus?  Civilians can't legally use the USN TBT ant-fouling bottom paint they bought through surplus channels.

http://nsglc.olemiss.edu/Advisory/Antifouling.pdf