Bike Yakult? How to treat the inside of a steel frame

bluechair84
bluechair84 Posts: 4,352
edited September 2009 in MTB workshop & tech
Does any one have any advice on how I can protect my steel frame? I've noticed brown rusty water inside the seat tube, I suppose it's expected that water will penetrate here but how can I protect the inside from rusting too much?

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