Originally Posted by
machinist42
Your photos show filoform corrosion. Seat tube looks relatively free of rust, if some of the brown is grease as I suspect.
I'll leave evaluation of the seat tube cinch area to more those more learned in frame building.
(I will note, however, that closeups of corrosion gives me the willies; rather too much like looking too close in the mirror in the morning, or using one of those magnifying mirrors... Ack.)
That sums up what I was feeling while looking closely at this. Also not sure how I feel about knowing these could be caused by the previous owner's sweat. But I hope this is the worst of it. There are no other filiform corrosion anywhere else, just paint chips and scuffs all around.
How should I treat this? Just sand off the rust and paint? I have some black enamel automotive paint that I was thinking of brushing into those spots and wet sanding to make uniform.
I really appreciate your feedback!