I used OPI various base coats for--forever, really, but I had chips--lots of them. My salon tech said that all the spas worth their salt use CND Sticky Base Coat, so I bought that and, literally, whole nails of polish would come off my nails in 5 days (they say I must've gotten a bad batch, but I decided not to take a chance. When buying my favorite LLP color, "Cake Pop", I needed add ons to get free shipping so I added this to my cart. What could it hurt to try? So I did and now my nails last for 7 days with only minor, teeny chips. I'm totally sold on this product. Haven't noticed much of a strengthening difference yet, but ****--this base coat works well!