I received my Cert through Naturalash, I do like them but I am questioning the Lash life? Some people have been 3-4 days, some 10-12. I am aware of education/aftercare and my own technique. I am having a hard time telling people these last 2-4 weeks!
Semi~perm lash extensions are just that.... semi~perm, lasting as long as 6 weeks. However, it does depend on the clients home care. Perhaps they are belly sleeping with their face planted in a pillow, using oil removers.. lots of factors impact the longevity!
If you are having ALL extensions come off within 3-7 days, it could be the quality of the glue. also are you using a quality primer to remove all oils from the lashes? I've never heard of Naturalash. I choose to go with a more recognized name, instead of going the cheap-o, save a buck route (been there, done that). Try Lavish Lash, Nova or Extreme. These companies give great tech support, quality products and stand behind the adhesives.