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It could be the sealant, it shouldn't keep oozing as it should dry out and form a seal.
Leaking sidewalls is an issue with all brands and usually goes away after the first ride.
Same pair of Schwalbe/Continental/Panaracer/Vittoria, one will leak, the other doesn't BUT most importantly, none returned with continuing leaks.
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Toothpaste.
Bit of water to work it in.
Don't try to rub it, it'll mess up the cotton.
Rinse and repeat.