Originally Posted by
chaadster
OMG, this valve stuff is getting out of hand.
The valve should be airtight on its own, regardless of sealant and regardless of position.
Valve position when airing up should be irrelevant, except, perhaps, in the case of inflating with a CO2 cartridge, because some sealants respond badly to being blasted with cold gas.
Agreed. I was waiting for the magic insight but, alas, I see none.