First, if you don't know why the tires are leaking, then the effectiveness of anything you might do is suspect. So step one is to find where they are leaking. Spray bottle of soap and water works here.
If the tires are leaking at the wheel/tire junction (rim edge), or at the valve or through the wheel (yes, alloy wheels have been known to be porous!), then the slime isn't going to work.
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