Opi was the brand they used in school for training. Opi is a good professional brand. I definitely noticed gel polish stayed longer using this. May take longer to soak of the gel polish, it seemed so in my experience.

I bought it by mistake, I just inattentively read its purpose. But I use it and I'm happy! For good adhesion of the varnish to the nail surface, I like it! Slightly prolongs the durability of the manicure. Such a necessary but not at all obligatory piece in my arsenal, but it came in handy for me. There is nothing to compare with. Before this bottle, I have never had such products.

Found that gem in tkmaxx, I use it before applying gel polish, and can do same before regular. It does prevent your polish from lifting of your nail bed. Prolongates wear, because it removes all oils from nail. Brush is small and easy to work, air dries in seconds, so it is not going to add much time to your manicure, but it is worth to use it. My mom is working in gloves 8 hours a day, 6 days a week and she is getting 2 weeks of gel polish, without bond max week. On pic is design I did on my mom for St Valentine's coming.