I'm with lost cause on this one> X2 for the clean sheets! Another tip is when the edge of your spreader starts to seperate, rub it back and forth on a flat piece of cardboard to flatten the edge.
I use a 1/4 thick pice of glass. I like it because after im done i take a razor blade and scrap it clean and it's ready for next time and it don't flex.. works grate.. I have had the same pice for 7 or 8 years.