Oh yeah. Never happened to me before but for some reason, I just can't stop this particular valve/tyre/rim blocking the crap outa mine and causing slow leaks.
Have you got any supplier/brand that you've bought off Ebay that has been decent quality and that you'd recommend?
I found if the tyre has deflated completely (but still seated on the bead) - it's worth making sure to put the valve toward the top of the rim and giving a few seconds for the sealant to drain away from it before inflating. I did one inflation from flat with the valve pointing down near the sealant and I think it breathed in a bit into the valve and gunked it up pretty significantly. It still sealed, but it was a bastard to top-up trailside until I replaced the valve core.
My tyre wasn't fully deflated and it still got in. So I pulled the core out, cleaned it up along with the shaft/housing and pumped it up with the valve at the top of the wheel away from the sealant. Stupid thing is gunked again, NFI idea how or why. Never happened before either. I blame Trump.
Your valve must have a slow leak, sealant is gunking it up as you ride. New valve is the answer, but yes Trump is the problem. Would be nice if he popped his valve permanently.
This. I only did one wrap to test, but not seeing any bubbles after the soapy water check. I'll add another wrap (or redo 2 wraps) once my new valve turns up. Also need to add sealant, but still trying to decide what to get.
When we first started to use it someone on here tried one wrap but it burst a hole through the rim nipple hole. If you do a double wrap, it just adds a bit of insurance against it happening that's all.
That was me ! Still using the stuff but with 2 wraps now . As far as sealant get the rubena / mitas stuff on ebay 40 or 50 with good valves included .
I'm in the same boat. My carbon rims are stupidly tight, even with normally quite loose-fitting non-tubeless tyres, so I wanted the thinnest tape layer possible to not make the fit any tighter than it already was. I'm probably about to jinx myself, but I haven't had a single problem with a single layer of blue Bear tape.
I found that mitus stuff to be a little thin, I had a bit of saga where I pinch flatted a front tyre and it wouldn't seal above 20 psi. I'm still using it but I added some glitter to the mix now. The tubeless valve kits are great, I've had no issue with them for years.
Agree with everything you said except for this. If you’ve done everything else right you only need a finger tight valve and in fact you can create a leak path by over tightening and damaging the rubber on the valve. It’ll also save you a shit load of frustration if you need to remove the valve core with your hands trail side to fit a tube
Hmmm, good point. I think my tightening suggestion may have been common practice for me after having a small leak on my first ghetto tubeless set up, I'll try it without pliers next time.
Get all my tubeless valves from Aliexpress. Dirt cheap but just be prepared for slow delivery
