DrRog said..
i had propspeed done last haul out and ran the prop weekly. wasn't that impressed with it so gave up making sure I got to the boat every week to run it. hard AF next time i think. or that lanolin grease sounds interesting.
I retract this comment. I dived the hull today and the prop was the same as it was a few months ago - just a few little worm tracks or whatever on it. I had assumed this was the start of growth but it doesn't seem to have progressed.