Re: 1976 22' Starcraft Islander Rebuild
Thanks fanny, appreciate the advice!
OK, so here are a couple of thoughts, totally unrelated and random:
There was some talk a bit ago on zincs and such - a friendly iboater pm'ed me this info written by Michael Kasten.
http://www.kastenmarine.com/aluminum.htm
All Water Summary:
Contrary to some views that have been posted on this forum, the anode(s) should be attached with a solid mechanical and electrical connection otherwise there will be no galvanic action in the area of the anode, thus no sacrificing of the anode. In other words, your hull, motor brackets etc will be eaten as well as the anode.
Also, contrary to other claims, having too many anodes can be worse than not enough and putting anodes directly on thin aluminium hulls without a doubler plate causes corrosion due to the action of cathodic protection producing an alkaline solution in the immediate vicinity of the anode.
If you do want to put an anode on the hull, it is also good practice to ensure the application of a very sound hull coating system on the doubler plate and immediate surrounding areas, (Epoxy or Etch primer are good followed by a decent top coat). The attachment of stainless steel studs to the doubler plate rather than the hull itself also ensures that any mechanical damage does not tear studs and anodes out of the hull plating and thereby jeopardise the integrity of the hull.
Fresh Water Specific Summary:
So your best bet for freshwater use is to use a couple of decent sized zincs on the motor bracketry and ensure they're electrically connected to the hull. They will protect the hull for literally years if the water is fresh, clean and not brackish. Keep a good eye on the anodes and never be tempted to paint them or cover them with grease. When out of the water you can spray them with WD40 or similar to stop them being corroded by atmospheric moisture.
On an entirely different note...
A while back I ran beads of PL along the bow deck supports...
I finally took the time to hop up there and walk around, man what a difference! Before, it was way sloppy, almost felt like I was walking on an old thin metal gas can. Now, there is still just a little bit of give but very firm, nice!