I use parafilm to seal my perfume bottles and always buy it in strips when in Europe. It came from Germany. Now that I'm back in the US I decided to buy a roll and found them even better than strips because you can cut them to any size you want, both lengthwise and crosswise. This is a great product for sealing liquid bottles or vials. You simply remove the backing and take one end, stretching the ribbon a few inches or so before you start wrapping it around the neck of the bottle. Then press one end against the bottle, keep pulling and wrapping the band to achieve a perfect fit. The product then shrinks back slightly to its original shape, creating a watertight seal. Highly recommended! I believe this product is designed to work in a lab, so it is of high quality and efficiency. A++++
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