The grout I used said ready in 24 hours, but felt soft after a week. Cheap stuff bonds differently, almost like it needs a second chemical reaction. Three days is the sweet spot for a real cure, not just a dry surface.

@seana14 Yeah, the price tag definitely makes it feel like a gamble on a gimmick.

Patricia nailed it - I spent 8 hours on a failing Seagate once trying to patch bad sectors before giving up and swapping it out. Full replacement is almost always faster and more reliable than playing whack-a-mole with errors.