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  1. I’ve never had much luck with the Effetto Mariposa sealant. People seem to have the best luck with Stans or Orange Seal in these situations. I’ve used both on my bikes with good success, but never had such a leaky tire.

    Swap sealant, and be sure to let the wheel rest on both sides for a bit, while inflated, to give the sealant a chance to soak into the sidewalls.

    If it doesn’t improve, new tire time.

  2. Man I have some Conti Baron tires leaking sealent like this. There is only one rule: If its leaking you dont ride it enough! Thats the only way to get that ooze where it needs to be to seal up.

    But there is another rule: The thinner your tire the more trouble you will have going tubeless. Therefore sense is questionalble under a certain width. MTB tubeless only! Roadbike Tubes only! Gravelbike is absolute no man’s land!

    Good luck!

  3. Repulsive_Fox9018 on

    Yes, that’s totally normal for a “tubeless-ready” tire. It needs sealant desperately. I’ve even heard it said you should top up your sealant the next day in case the tire ingested a lot just sealing itself that first time.

    Once you’ve done your first seating of a tire and filled with sealant, you need to shake the tire all around, getting the sealant coating all the inside surfaces, and a ride soon afterwards to help set the sealant helps.

    In theory, “tubeless” (not just “tubeless-ready”) tires are perfectly sealed from the factory, but they’re heavier, less compliant, and more expensive.

  4. Nom_De_Plumber on

    Some tires are a bit porous initially. Wave the wheel around so that the inside of the tire is coated with sealant and it should stop after a bit.

    I’ve had it happen and it was never an issue after that initial weeping stopped.

  5. brookegravitt on

    I can tell you that my Schwalbe tires leaked sealant like a sieve when new. My GravelKings less so. But I went through the gauntlet of different sealants before finally settling on OrangeSeal Endurance as the default for me. I had a set of MAXXIS Minions that also leaked a bit initially, but never had an issue with Rekon Race or Conti x-Kings.

    I’ve never put pepper or glitter or any of the other things that some folks do to beef up the sealant, but for whatever reason, the new Schwalbes wept until I put extra helpings in each, and settled down after a few miles. YMMV

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