I've had them for a few weeks now. I wiped down the sides of the fridge with antibacterial wipes, let it dry for 30 minutes, and then attached the strips. I've had 5-6 knives on each strip since I've put them in and haven't had any problems. They still stick well to my fridge. Those with sticking issues are likely trying to apply them to painted walls with oil/grease buildup or even textured walls to keep them from sticking. If you are concerned I would recommend applying a dab of super glue to ensure they stay in place.
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