Quoted from xsvtoys:Art I think I got the recommendation from you a few years back on the Everbrite:
https://shop.everbritecoatings.com/index.php?main_page=index&cPath=6&products_id=23&zenid=fc667344e4ce239b64f49b2da9dbc079
I used that with success on my Monte Carlo. I had this exact problem after I buffed the lockdown bar and cleaned it all up and got it all shiny. A few days later it was all rusty. I then redid it and coated with the Everbrite and it had held up since.
This post has pics of what all that looked like.
https://pinside.com/pinball/forum/topic/bally-monte-carlo-restoration#post-2777719
I have used Everbrite in the past and it really worked well. I don't know if there's different versions but the one I used was a spray can to apply and then bake in the oven to cure it. Not hard to use and looked great.