anyone with experience flatting and just how big of an ass pain it is? I thought i read somewhere that some people fix tubular flats with sealant through the valve stem? i can't imagine myself wanting to snip apart, patch, and resew a tubular. Would an lbs do it for me? might be worth my time and aggravation to do that, though if i flat out on the road, I need to be able to get back up and running!