[Public-List] how to keep propellers free of marine growth

[The Rochets]

A few years ago, someone mentioned a product that could be sprayed on the propeller to prevent barnacles. I used it and it worked. 
Unfortunately I ran out of it and I forgot to note the name of the product (I thought I had but if I did, I don’t remember where I filed it).
Does anyone remember the name of that product or have any suggestion for a replacement?
Thank you.
Bernard Rochet
Sunswept 608