A package of Wrap and Zap at Walmart is much cheaper then at JoAnns, at least here it is. I bought a bolt last week for $19.99 for ten yard bolt or $4.79 for small package. I always test batting in the microwave before using. I cut a piece and put in microwave. The heat depends on the microwave and everyone has different wattage ones. The lower wattage ones take three minutes to get as hot as the the high wattage ones do in one minute. 100% no scrim cotton burned in seconds in one of my tests. Warm and Natural didn't even get hot. But I do the test every time. Never know what batting may contain. And if there is food spilled on the cozy and not seen it will cause a burn/fire. I would never put insulbrite in a microwave. It does have metal in it. Some microwaves can handle some metal some can't.
We never heat a cozy more then two minutes, food is steaming in two minutes and less if not cold.
Last edited by Onebyone; 09-01-2022 at 06:28 AM.