So, I've done a couple of very very fine line designs with very thin layers and it is ok-ish. If I use just a bit more than I should it will not cure and the design is completely ruined. Yesterday I tried to paint my whole nail with an extremely thin layer and it WOULD NOT HEAL. UV LED lamp for 90 seconds, recommended is 30 on the website for UV LED and it would not heal. Tried three times. Definitely a waste if you want to have a nice chrome nail paint for the whole nail and that is a shame.