Rust inside frame - what to treat with ?

What products has anyone used to protect the inside of steel frames from the dreaded rust ?

Had a peek inside my Marin with a torch and seems ok apart from some small surface rust on the BB

I have heard of Framesaver, or is using something like Kurust etc better/cheaper

Just want to give the old frame the best possible chance of living until its 30

Old sump oil.

Personaly thought about this with old motorbikes an cars ect. Think they use wax oil but not sure if it would just cover the rust an slow it more than cure it

That's what I was worried about

JP Weigle framesaver all the way.

Cheap insurance against the rust demons.

Only £10 odd, worth that and does up to 2 frames so I can do the old roadbike also

I used this stuff :



WD

I would be in trouble if my Wife caught me doing that in our kitchen

Rusting requires water and oxygen. While it won't make existing rust go away, coating it will top these two meeting the steel, so corrosion stops.

Is rusting on the drain holes of the frame a major concern or am I being paranoid

I have shone a torch and only see Chanpagne colour apart from one hole.

I assume there is no way of checking inside the frame with using a hacksaw

Has anyone got stories of steel frames crumpling due to rust ?