Originally Posted by mikeod
I have heard the same from a Marina owner in Florida
who hauls hundreds of boats per year that boats who had writing with marker on the prop had less growth where the marker was. I saw him applying it to his own prop and asked what the deal was. He swears by it and also said only one brand seems to work, possibly marks a lot. He also sold the markers in his ships store for that purpose. I have not tried it but why not next time.
So the question to ask is, what ingredient is in "Marks-a-lot" that is not in other permanent markers?
Apart from the 'marker' discussion, the general subject is very timely for me; I've just had my boat
hauled, power washed & bottom paint
. She has now been returned to her natural element & I'm anxious to see how this new bottom paint
works out. The previous product did not work well at all but I've forgotten whose product it was.
While they were at it, Pt. Roberts marina staff also replaced all zincs, cleaned the prop & applied a product called "Speed-prop" after which, it looks like they also applied bottom paint
to the prop too ... same with the S.S. rudder
So I'm thinking they're using the Speed Prop product as a primer maybe? - Prior to this, there was no coating of any kind on either prop or fittings & they were all covered in growth after approx 2 yrs in sea water at Point Roberts in the PNW.
Another thought comes to mind ... in years gone by, we applied copper undercoat paint
to prevent growth. A good prop is usually made of BRONZE
which has a fair amount of COPPER in it I believe. If that be so, why do we have barnacles
& mussels attaching themselves to it?