LiME LiNE Tape Removal Blades Review

I got these blades after seeing a guy cut vinyl tape with them on a custom varnishing machine. I tried them and they didn't cut the vinyl tape I was using. I'm not sure if they only work with Lime Line Tape or if I'm doing something wrong. I'm still trying to use them to cut the washi tape I use to mask the patterns I make and see how they work with that.