The aluminum strip that holds my washboards on has badly corroded around one of the screws. The corrosion was so thick around the screw it pushed the strip away from the deck over 1/4" and then cabin top lines started snagging under it.
The strip started 1/8" thick, but it's less than half that thickness around the one screw hole after I wire wheeled away the corrosion. The back side has some kind of black plastic coating or lamination on it.
What should I do to stop the corrosion from progressing where it has started? And what can I do to fill the parts that have corroded away back to original thickness?
I'm thinking I'll clean with a brass brush, spray with zinc chromate primer, and then fill with phenolic thickened epoxy.
Is the zinc chromate under epoxy a good idea, or would it only be appropriate if I was going to paint, and I should just go straight epoxy on the Al? Do I need to treat the Al with something first, like lye or alodine? I have neither. I do have some over cleaner, that's like spray on lye, isn't it?