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First time out?
Probably lost most of that in the first twenty minutes. If there was a good amount of sealant in them then they should be sealed up nicely now.
Give the wheel a shake? Can you hear sealant sloshing around? If not, or it's hard to hear, top em up. I do this with a syringe plugged in to the valve stem. Actually, handy hint if you do it this way - squish a section of the tyre flat before you pop the syringe in, then after you've inserted the syringe release the tyre, and the sealant will get sucked in, and you'll get no ejection / spillage (fnar) when you withdraw (fnar).
Howard
@Jon.
Should I worry about 5 psi (15% of total preride pressure) lost during a 4 hour ride? More sealant? Did not notice any burping (I suspect I'd have lost more if this was the cause?), though I did feel the rim once or twice.