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Is it nail varnish or some sort of two-pack acrylic that people use to repair damaged forks? Is it better to scrape all rust off first, or just patch over it to avoid making things worse?

Just use a sticker, any one should do it
Well the damage is mostly cosmetic, so I figured nail varnish was probably the way to go.
Fit an alloy pre-loader cap, that'll sort it Hols...
convert to coil so you can see it working
Fit an alloy pre-loader cap, that’ll sort it
Thing is, the hub bearings are bit knackered and the forks have to flex to take up the slack, so I don't want to increase the stiffness or it might cause problems.
Also, they are some sort of Suntour fork. Most forks I disassemble have some sort of rusty liquid with lumps of mayonnaise floating on top, but these had a watery black substance that seems to be really good as a floor stain. Problem is, there was only a bit there, not even enough to just do the toilet floor. I was hoping to stain the living room and hallway. Any idea where I can get a couple of gallons of that fluid?