I recently acquired this from the estate of my parent's neighbor. Looks to be all original from 1968 and still working. Any suggestions on the most practical way to touch up the flaking black coating on the tubes? Also, the red tube seems brighter than the white/yellow tube and is actually eye straining to look at. Is this normal? There is no adjustment on the transformer.

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Thanks for all of the detailed info and resources, guys! I am going to try to get this sign looking like new again and don't want to screw it up. I knew about the red being neon gas, but would like to be able to dim it a little since it is so piercing that I see sun spots after looking at it. It's just a bit too much and I didn't see any way to adjust it on the transformer, so I wanted to make sure I wasn't missing something. I will have to do some digging on those dimmers.