After shining the lamp, the nail polish falls off in whole pieces, what's going on?

The whole piece of nail polish falls off, most of which is because the primer is not firmly attached, or the nail surface is not sanded and cleaned, so the glue cannot "catch" the nail, and the whole layer will fall off.            

1. The pre-treatment is not in place
Without sanding the nail surface, the smooth nails make the glue "sticky", forgetting to wipe off the grease and moisture with the cleaning solution, the nail surface slips off, and there is no dead skin
2 The primer is not firmly attached or does not dried
The primer is the "basic glue" of the entire nail art, and if the primer is not illuminated, it is useless to be perfect in the future
If the primer is too thin, there is no edging, and one side is missing, it will cause the whole piece to fall off
3 The edges of the nails are not covered with glue/there are gaps
If the finger edges and fingertips are not sealed, air and moisture will slowly seep into the → from the edges, and the entire layer will be warped
4. The coating is too thick / not transparent
If the color glue or sealing layer is too thick, the surface is dry and the bottom is soft, and the glue layer is not firmly "fused", and the whole layer will peel off in a few days
5. The order of use or brand is not compatible
Different brands of primers, color gels, and seals are mixed, and the ingredients may be incompatible and the layers will fall off
Or skip the primer and go straight to the colored glue