I had to repair the aluminum prop on my 75 horse Merc powered 'toon when I got it.
Welder here at work fixed up the dings.
Rather than just repainting it black,
I had a wire wheel on my 4" disc grinder and went to taking off the rest of the paint that did not get melted off while welding.
I knew how fast it would oxidize if left alone so I shot a bunch of clear coat on it.
I think 4 neighbors have asked why I spent the big $$ on a stainless prop for a 75 hp toon?
But...
I am the guy that increased his 35 horse Mariner to 85 with a simple paint marker a few years ago.
LOTS of folks asked how fast that lil' toon went with so much motor

Silly huh?