I have Invisigrip on all my rulers, sandpaper dots, clear dots... they STILL slip!I have a puchased cutting table which may be too high for me to get the right angles on the rulers/ cutters? I am 5'3". That's average, isn't it? Anyway, I've been using them for years & have cut myself many times because I'm holding the ruler too close to the edge to keep it from slipping! BUT, I still prefer them to scissors! lol! Good Luck!