Not to worry, simply set your stencil on a flat surface and use the smooth side of a pen and/or marker and gently rub out the bend/crease. Repeat this step front and back until flatten out straight. If it’s still has not laying down completely, try applying heat from a hair dryer (NOT A HEAT TOOL) at about 3″ as Yupo is a durable plastic which is resilient. Watch this video as an example on how easy it can be Watch Video.