This is a Ridge Filler which can be also used as base coat. Sometime the nails do not have smooth surface and so when ridge filler is applied, it gives the nail polish a smooth look. I got this from Sally’s Beauty for about $ 2.50 . This was recommended by MissChevious from YouTube as she uses this as a base coat.
I thought why not give it a try as its very inexpensive. It also eliminates rough spots in the nails which give a smooth surface for the nail polish. I have been using this for all my nail polishes and It is quite nice. It did give my nail a smooth look. It also suppose to give extra protection for the nails and cuticle.
This is the base coat which I use all the time and I am happy with it.