We applied bottom paint
on the paddlewheel, sparingly so as not to unbalance it or jam it. But the most important thing?
You simply have to REMOVE THE PADDLEWHEEL every time you secure the boat for port. Remove it, put in the plug
, if you're any good at this you should take all of a quart or two (sorry, two liters, eh?) of seawater and that goes out the bilge
Leave the plug
in place, until and unless you need that speed-through-water data again.
A toothbrush and dental pick take care of whatever gets by you. Find a good French cook and add that into the bouliabase. (G)
You may still be able to buy special antifouling for depthsounders, I think it is or was a banned tin product that is very effective and very thin. That might be better than conventional bottom paint
on the paddlewheel.