Hi Skip,
I am really curious regarding this paint. I own a fast boat and I noticed that when I switched from a hard anti-fouling to a soft self polishing one cursing speed dropped from 30 to 25 mph average. This paint makes even less friction than hard normal anti-fouling which would results in more speed and huge fuel savings.
As for costs I will check with the Hempel factory at Cordin but I found this website also as an indication of prices.
https://www.svb24.com/en/hempel-silic-one-fouling-release.html50414 Primer TIECOAT 750 ml €28.95
50412 Fouling Release SILIC ONE red/black 750 ml €59.95