If the silk or fibreglass isn't sticking it could be due to............
1.Contamination of the material.............dust/oil on the back, dust/oil being transfered on to the nail................. Before I apply any material be it Fibreglass or Silk, I quickly dust down my work station and give it a quick spray with clori-spray............
2.A bad or old batch of Fibreglass or Silk..........let your supplier know, they might have had other complaints.........
3.Silk or Fibreglass not being kept in a proper container which will keep out dust , oils moisture and other contaminants.....
Keep your Silk or Fibreglass in nice box.......I have a nice pencil case metal tin type....
4.Avoid touching the Silk or Fibreglass where it will adhere to the nail, if you have touched any of it even for a second it reduces sticking power as the oils from your fingertips will provide a barrier and and oily surface will repell the resin.........
5.Try using the other end of the strip..........Is the silk or fibreglass curling away from the backing paper while you are cutting it....... then it is not going to stick very well to the prepared nail.........Try a new strip, fresh out of the packet..........
Do you apply a layer of resin, providing a nice shiney smooth surface or do you place it on the nail directly after blending and not after bonding???? Base the tip with the bond to provide a good clean bonding surface lol...............
6.Did you over wet the material, to much resin and it will curl up and try tofloat of the nail............and it will also add resin to your sidewalls and cuticle area and then stick to skin and not keratin, hence the lifting..............
As for a broken Thumb nail......this happens and can happen to any one.. look for stress marks on the natural nail, it will be a dead give away if force has had something to do with it..........
Did you over blend the tip and reduced the strenght of the tips sidewalls, did you over use scrubfresh, this can lead to tips breaking.........
At then end of the day it could be all down to the client, you will have to check the nails and then make a decission...........
Just a few check points Hun...........