Lanacote works, but you need to be out of the water
to do it properly
Clean the prop absolutely..then heat it with a hit air gun..then oaint heated Lanactoe on...should do 6 mths in temperate waters.
In warm waters it doesn't last
Propspeed lasts well in temperate waters, but since leaving my boat in Fiji
where the water
is 29-31 degC...oysters grow on it if its not moving
If the prop turns every day or so it seems to last 12 mths
cold galvanising I haven't used...but is zinc a biocide ???...its organic growth thats the issue...