The best way is linseed oil varnish. This preserves the rust under a hermetic layer. The expensive metode would be owatrol, but I find not as pretty...
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LFGSS
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
here
This site is only in german, sorry for that.
But they speak english.