Nope. You can use Stan's in tubs and it's perfectly fine. Works for Clinchers, too!
Right, you meant the sealant, not the rims. Skidding doesn't really cause more punctures (as generally intended) but given that most tubulars are lightweight and super-thin, you will need change tyre every other week if you plan to skid on them.
@Breso started
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Nope. You can use Stan's in tubs and it's perfectly fine. Works for Clinchers, too!