I have been using this product for several years. It's a great, tough, crystal clear product that can be worn alone as a clear shiny polish, or underneath regular color nail lacquer as a base coat. I don't use more than one coat if I'm going to use it under polish, because more makes a very slick, shiny coat which isn't good to hold on to polish. But one coat as a base works fine. As far as it being a "nail strengthener" is concerned, it's a strengthener as long as you wear it. But after taking it off, you still have the same nails you started out with. In other words, it makes a great tough protective coating to keep your nails safe from bending, breaking, splitting, peeling, etc while you wear it. It's more like "nail armor" than strengthener, in that it makes no bonds with, or any changes in, the natural nail on which you apply it. But it's a very good quality shield, and it does indeed act as a great base coat in keeping the very highly pigmented nail polishes from staining your natural nails. It dries very quickly, and stays on until you take it off. If I want a very shiny, even layer of clear polish on my nails, I use two coats of this, followed by a coat or two of ORLY "Won't Chip" on top. That makes for a really even, flawless, "shiny like you won't believe" clear polish look. I'm wearing it right now, and the natural daylight just shines off the top like nobody's business! It has, however, provided my very weak, prone to split and chip, nails with enough protection to allow them to grow out past my fingertips a good way. I have nice long squared-off nails now that are my own - I didn't have to go out to a nail salon and pay someone to glue them on!
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