Measure and cut the fabric to the desired size. A 12’ square makes a good-sized sandwich wrap.
Melt the wax gently, over, not in hot water in a double boiler.
When the wax has melted completely, lay a single piece of fabric into the hot wax. Using tongs, flip it over, if necessary, to ensure that all surfaces of the fabric are covered.
Lift the waxed fabric from the pot and hold it over the pot. Allow the excess wax to drip back into the pot; this may take a minute or two, as a surprising amount of liquid wax continues to drip from the fabric, As it drips and cools, the fabric slowly gets stiffer. Take the opportunity to hold it from different corners, and make it as straight as possible.
When all the wax has dripped off (or your arm gets sore), set the fabric aside on a non-permeable surface, and lay it out as flat as possible, without being too fussy. Repeat this treatment with the next piece of fabric.
If there is excess wax on the surface of the fabric, you will need to use the heat gun to dissolve it. Cover a work surface with paper towels, and lay an unwaxed piece of scrap fabric over the towels so that they do not cling to the wrap. If desired, this “scrap fabric” can actually be an unwaxed sandwich square; it will absorb some of the wax from the fabric above it and will wind up at least partially waxed.
Lay the freshly waxed fabric over the top of the work surface, on top of a scrap of unwaxed fabric. Using the heat gun, slowly run the heat over the wrap, starting in one corner and working methodically across the fabric until all the surface has been warmed.
While the wraps are still warm, gently tug at the corners to pull them into shape, if necessary.
Once the wraps are cool, they will be quite stiff, but they soften with age and use. The warmth of your hands as you wrap them around a bowl or a sandwich helps soften and form them to the desired shape. To clean them, simply wipe them down with a damp cloth. If needed, wash by hand in cool water. (Hot water will melt the wax.)
Use the wraps as suggested, to fill with snacks or leftovers or other treats.
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