I bought some of this earlier this year. My Dh wants me to make a cover for our gas fireplace in our vacation home. It was so cold this winter and so much snow that he didn't use the fireplace that much. It was warming the roof and creating ice. So he put plastic over it. It billowed out so I know there is air leakage. So sometime in the next couple of months I have to make a decorative front and a casing to insert magnets and then it will stick to the fireplace and it will look better than plastic and painter's tape! The only difficult part will be making the part where there is a protrusion at the top - like a flange or something- i'm thinking a dart would allow for that. I hope i can figure it out simply- sometimes my brain doesn't like designing stuff!LOL