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Most decent tubulars come with removable valve so with some sealant can be used again if they puncture too
I'm not too happy with the idea of sealant in a damaged tubular tyre on the track. Last thing I think I'd want to see is a sealent plug go flying from a tyre inflated to 13 bar, its latex sputting onto the track like Bukkake .. Tyres can be repaired. If you don't want to repair them then chuck them but....
@crazyfields I would think they do last longer and offer better performance and yep they would be better if punctured from what I have read up. There are a few sets on ebay atm goin for cheap if you search 'tubular' and dig through the other stuff. Most decent tubulars come with removable valve so with some sealant can be used again if they puncture too
http://www.ebay.co.uk/itm/Conti-Podium-700-x-19C-Black-27-x-3-4-Tubular-Tyre-/131576016006?hash=item1ea28aac86