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I found using rubber o-rings before the locknut on the valve plus putting a dab of sealant around the valve on the inside and outside on aforementioned o-ring and letting it dry before pumping up did the trick on IRC and XR22t rims.
swmlon-
I don't do any of that. I use valves with and without o rings with any issues. I inflate and seat tyres with no sealant at all and then inject sealant for a clean install unless I have a blocked injector then it gets messy. Get the valve collar tight. Soapy water, track pump and bingo. Done too many for it to he any different. Occasionally I need to charge the pump but that's rare.
cycleclinic
Tried all tricks on the 26c and kinlin xr31t rims+ double stans tape+schwalbe sealant can't get them inflated even a bit, Ymmv though.