To use this eyeshadow, start by prepping your eyelids. For the matte look, apply a thin layer of the eyeshadow using an eyeshadow brush. Build up the color by layering for a more intense effect. For the glitter look, use your finger or a damp brush to pick up the product and press it onto your eyelids. This will help the glitter adhere better. As for maintenance, keep the eyeshadow in a cool, dry place. Make sure the lid is tightly closed after each use to prevent it from drying out. And always remember to wash your brushes regularly to avoid any bacteria build - up. Also, if you have sensitive skin, do a patch test before using it all over your eyelids.