I use it before cutting - I think it really helps with precision - also if I'm working on something with lots of pieces, I will use a little sizing on almost every seam as I'm working on it - Then, I'll starch the you know what out of the top before I quilt it. My husband gets a kick out of my starch buying habit. I rarely make a trip through the grocery store without picking up a can as I hate to run out of anything. The top of my dresser is littered with all brands of starch & sizing.