QUOTE (quantumchromodynamics @ Nov 9 2009, 07:43 PM)

Corrosion can end up on small areas for a variety of reasons. There may have been damage to the paint at the area, or a mixture of air and water etc. An anode could be connected to the aluminum by a wire. The anode should be buried in the ground near the pool where the ground is the wettest. You could also put one near the corroded section. You could connect the anode to the grounding wire.
Thank you. I own an aluminum boat and have some zinc to use. Will connect one to the bottom of the panel near the trouble. Q: How much zinc to use? How to repair from the outside?