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Great frame, looking good with the LA84's!
Out of interest, how did you treat the inside? My Columbus air lo pro has the aero seat tube and the seat post is not particularly tight fitting, so water can enter the frame relatively easily. Although I'm trying to avoid riding it in the rain it would be good to know how to avoid any rust on the inside.
BTR88-
I make sure inside is dry and then bung all the holes and sloosh about some Hammerite Kurust (about the only one that's any good).
After that the best on-going preventative would be Duck Oil (WD40 evaporates and is not long term effective)
With your seatpost I would insert it with about 1cm to go then tightly wrap one or two or so layers of ptfe (plummers) tape this will conform to shape , is cohesive nut not adhesive and will help reduce any water ingress -any left showing is easily removed with a finger nail.
Si46
All surface rust was very thin so brass wire brushed spots with dremmel and treated . Then fully treated inside although was very clean and shiny inside.
I quite like the well used look so little to do on paint front.
Just need to decide on wheels -I still have no idea what wheels the Bulgarian team ran on these !!!! ?????