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Photopolymer Stamp – First Use Guidance When first unpacked, photopolymer stamps may be firmly adhered to the backing sheet. This is a normal characteristic of high-quality photopolymer and can occur when stamps are newly manufactured. If the stamp feels difficult to remove, please do not worry. Gently warm the stamp by allowing it to reach room temperature or by placing it near a radiator for a short time (do not apply direct heat). Then carefully work around the edges of the stamp, lifting gradually until it releases from the backing sheet. Once removed and used for the first time, the stamp will perform as intended and will be lower tack when placed back onto the backing sheet for storage.