Kiss diamond hard is a very well knowned nail hardener amoung the nail polish comunity. Being a nail polish blogger and reviewer for almost 3 years now made me try, test, review and see a lot of products doing a great job and fullfilli g their goals.
Some products have failed enormously.I heard about this product in my very first months into the world, and i liked it so much that I actally emptied two bottles of it. It does help harden the nails and it does make them grow faster and stronger.
Nowadays I can't bring mylself to use just one base to finish because of the amount of products that I have to review.
However, if I had to pick a top 10 bases to use forever, this one would be there. I still have a 3rd bottle of it and I still use it. It was one of my first favorites. I recommend it a lot.