I think John C is right. The spots should be able to be blended in with maroon scotch-brite after you get the blue anodizing off. You could leave the finish like that, just like the factory made them without anodizing.
So what are your intentions for this boat?
Will it be to restore and recondition it to be show piece or is it going to be a real functioning recreational toy that's used regularly?
The answer to this question should be your guide during this phase of the project.
Proud Owner of 1956 Vagabond, 1950 Flyer, 1956 Rocket, Co-owner 1952 Flash, 10-1/2 less than VinTin
They appear to be spots that have been sanded/abraided in some way. Straps, covers, buckles, cushions, ropes, bumpers anything that was against the hull and repetitively moved back and forth, like when tied to a dock or while trailering at speed..
Might be sanded out, after removing the blue amodizing via Easy-Off and sunshine w a maroon skotch brite pad. From 220 thru 1000grit wet sanding will help hide the marks. But aluminum can be tricky to get perfect after surface 'damage'.
IMO, these (all?) boats have a history, scars and all. A polished hull w an occasional nick, scratch, imperfection or blem is still a great looking boat....
Mark - they are all over the exterior. More photos below. I would love to get all of the finish to the bare aluminum!!! It is beautiful when the sun glistens on it. I don't want it splotchy like this. And I don't want to repaint it. This struggle is REAL!
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Was the boat once anodized blue? A lot of blue anodizing on these old boats will fade to a pale blue/white... It looks like in these spots you managed to remove the anodizing down to the bare aluminum.
Yes Steve. It was / is blue anodized. And now I notice in prior photos that these spots existed following the initial paint removal. I just don't know if they existed prior to my brother-in-law painting? Or if they resulted during the process of my paint removal. But from what I read on the complication of removing the anodized finish, I doubt the DAD's chemical I used would have caused these spots. If by chance it DID, then I need to keep it up!
This might be a dumb question... but heck if I care! What is this change that is happening to the surface of my boat? I am referring to these circles of shiny aluminum poking through the older matte finish.
My guess is you accidentally touched it while out in the yard.
Never fails.... I ask a question and the clowns come out to play.
Happy Friday Dan and Rob!