by GreenLake » Fri Jul 22, 2016 1:02 pm
So you have a circular 10mm x .5mm patch of corrosion on the front of your mast, 6" away from the nearest fitting.
First question would be, what's the likely cause?
Second question would be, if you sand off the aluminum oxide, do you get a clean surface?
My first reaction would be: half a millimeter isn't all that deep (less than 1/32"). If you can figure out what caused this in the first place and prevent if from occurring again, that might be enough. If you don't trust that the aluminum surface will "heal" after you cleaned and sanded it, then perhaps a daub of paint?
~ green ~ lake ~ ~