Hi, I use IGI-4625 and have NEVER had fingernailing UNTIL I bought Gemlite FO. Then I got them,,,So I decided to test this,,EVERYTIME I use the Gemlite FO my pillars fingernail,,,this FO does NOT blend well in ANY wax or at any temp,,its the same everytime. HTH Went back to my best FOs and I have had not one Fingernail so I believe it is also the FO not mixing well. JMO