This is a rather involved instructable; however, the reward is well worth spending the hours (and i can guarantee you will spend less time on it than i did -- i had MANY problems which i will explain how to bypass). I like dualism and this project is perfect for me because the final product serves as both a normal can of Dust Off and a place to store some small valuable items.
The first step is to obtain an empty can of dust off (or another empty can of compressed air). Obviously if a can is empty you may not have one laying around, so i CAREFULLY
emptied an existing can which was low on gas. Follow the set of "DO NOT's" on the back and carefully use spray it until there is nothing left. Now comes the fun part.