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Update. I scoped the other tank. It's nasty inside but looks more caked/solid than broken pieces. The bottom around the drain orientation looks like chicken pox, and I have no idea what that giant piece of red bar is in two of the pictures, possibly solidified gunk of some sort. I think...

So, I am perplexed. I did a scope camera inspection of the interior of the tank. Looks like your standard aging rust etc. It also looks like the interior of the tank was painted green at one time (didn't know they painted the inside). Have no idea where this waxy looking stuff has come from...

Great idea! I actually have one of those HD See scopes, thanks for reminding me, I'll check them tonight.

Thank you, that was my thought as well regarding blockages. I'm a bit leery of reusing these for fear of some more of that stuff breaking off and going somewhere throughout the system so not sure if I should invest in a NOS set or try the acid and see what happens. I've never seen anything...

I used the search feature but found nothing related to this. I'm doing a complete frame off restoration on a '68 M35A2. Removed the air tanks to inspect, blast and paint. There are chunks of what I thought was rust inside the tank. Shook some out and it actually looks like some type of...