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I'm sure M_V's advice is good, especially for track riding.
However, for road use it seems to me one needs to be self sufficient. Tracks are not covered with flints, shards of glass or potholes. You will need to be able to cope with problems at the roadside.
As M_V implies, it can be difficult to mount tubs and get a perfect result. I've certainly had problems and I think there are tubs which are actually impossible to get completely even and smooth - especially around the valve on cheap training tyres.
Perhaps I'm showing my age with this last remark - I doubt whether there's such a thing as training tubs now, because you'd have to be a bit crazy to train on tubs when a. no one else does, so no one's going to have a spare if you run out, and b. wired on 700's are so good there wouldn't really be any point in using tubs.
Presuming this is for road riding and not track? If it’s for track then forget the cheap tubs and the tape.
I’m often asked for advice for fitting tubs and my answer is always the same, pay someone to do it for you and make sure it’s someone that does it a lot. Many mechanics will take your money and give you back wheels with tires that are sitting uneven and bumpy and with more glue on the sidewall of the rims and tyres than between them.