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If you want your mask to last through many wears, it is very important that you keep it dry. Because it is made of paper, if you get it wet, it will easily tear. If you're going to be wearing your mask in a very hot and humid environment, and you're afraid you might sweat on your mask, glue plastic wrap or line the inside of your mask with scotch tape to prevent the sweat from being soaked up by your mask. When you take your mask off, try not to put it somewhere that will make it easy for it to be squished. Place it on a shelf rather than in a drawer. Dust can easily ruin your mask, especially if you have glitter or feathers glued onto it. If you plan to keep your mask around for an extended amount of time, make sure it is covered. If you want to use it as a decoration, a shadow box frame is a great way to keep it clean while on display. To prevent your design from wiping or wearing off, just spray your mask with aerosol hairspray and let it dry.
Keep it dry. Store it flat. Cover your mask to protect it from dust. Preserve the colors.