Originally Posted by
fietsbob
you could pour in a rust inhibitor and then pour it back out , and a coating will remain.
whole assembled bike may be a bit heavy , maybe a repair stand will help as you invert the tube .
stripping it down may be too much work , you choose..
My 2006 Brompton has much less rust in the frame tubes, than on this picture of IRideISmile. Could I pour in metal paint? Or is rust inhibitor better, or just lubricating oil?