Common for steel frames to get surface rust inside, views are split on how to look after them.
When i have a frame stripped down or it's been subjected to swimming...... after draining and letting it dry out...... i go for a good squirt of WD40 down all the breather holes, far less hassle than boiling up linseed oil and swirling that around inside :-) others will have differing views on how to tackle the issue.
Rust in the tubes.
Common for steel frames to get surface rust inside, views are split on how to look after them.
When i have a frame stripped down or it's been subjected to swimming...... after draining and letting it dry out...... i go for a good squirt of WD40 down all the breather holes, far less hassle than boiling up linseed oil and swirling that around inside :-) others will have differing views on how to tackle the issue.