This one of the more disappointing polygel brands I've tried. I've had these for over a year, and have tried multiple times to use these for extensions using dual forms, applied to tips, or with an adhesive nail form. Every single time, the center of the extension does not cure, and I end up with uncured polygel leaking out from the back of my nail until the extension is completely hollow and breaks away. I have used them as a small part of swirled polygel with other brands, or for raised designSee full review