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If you’re doing it yourself, there’s really only two options, patch or pump something into it, like Fix A Flat or Tire Slime.
My preferred method is to use a motorcycle tire patch kit made by Stop N Go. It has a steel gun that inserts mushroom shaped plugs. It’s not the easiest to use as you really need a good sized hole like one made from a roofing nail. So for a slow leak, that’s gonna involve opening that hole up to patch it. But once it’s plugged, it’s not gonna give out.
I have used Tire Slime with good results for slow leaks on an old Z car with aftermarket aluminum wheels that had a few slow leaks around the bead. It’s supposed to be harmless on sensors but so are patches.
You just state that you have a slow leak but don't identify the source of the leak. If it is, in fact, a puncture and you don't plan on competing in track events, then plug it. Don't use Slime or Fix-A-Flat. Best is to break the bead and plug from the inside out. If the tech is good and doesn't move the tire on the rim, it shouldn't need re-balancing.