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I like the wee snail on the photo :)
(and frame looks great too)So, it's the acid then! That explains it, Lee Cooper doesn't like chroming and won't use it. I have a Merckx with chrome, I covered it in Vaseline (some use car wax) as water gets in through micro holes, rust pushes up and peels off the chrome.
Re plugging up holes, I tend to plug the ones close to the road, but leave the other ones open for "breathing".
JWestland
@revanche
JWestland, you're right. In short, it's the acids used.
Wrote a few words on the subject here http://revanchebikeco.wordpress.com/2014/04/14/do-framebuilders-dream-of-chrome-sheep/
Regarding rust generally, prevention is everything.
Rust can be a problem in some climates,
A lot depends on if the brazing holes are sealed or not, I seal them all, but you can do it yourself to a frame with some tape, or a plug of some kind
There should be a m5 threaded hole under the BB, take the bolt out occasionally, and if you've been riding in bad conditions, taking the seatpost out and putting the frame upside down is a good idea.
If your frame hasn't got a hole, drill and tap one.
Mudguards are also an excellent idea.
Niobium tubing is more rust prone, it's also pretty thin, so with a Columbus Spirit or Life frame you should be a bit more careful.
I use this stuff
as standard on all bikes, bit more about it here
http://revanchebikeco.wordpress.com/2014/03/24/rust-steel-framesaver/
Peter at Ceeway sells jpweigle's stuff.
Clear coating, I've done quite a few, preparation is key, takes ages, damn hard work and looks great.