Stan's or Orange Seal were the goto sealants a decade ago
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Do you mean over time, like if you leave the bike for a week then come back to it?
Or do you mean you are having trouble keeping it inflated full stop?
The tubeless tires on my 2nd bike are always flat when I take it out the carage. I use tubes on my main bike.
If you can get a nitrogen canister from somewhere, that's supposed to not seep through rubber the way air does. In plumbing we use nitrogen to fill the gas side of expansion tanks for this reason. It's a normal schrader valve on those things.
You can use a spray bottle filled with water and 10 drops of dish soap.
Inflate the tire on the hard side of normal
Mist/wet the entire tire and rim. Give it a minute and look for bubbles, foam or hissing... This will trace the specific leak you are dealing with.
The solution will depend on if it's the valve, rim, rim tape or tire that's leaking
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