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Why Do Card Sleeves Curl? [Solved]
If the card gets moist or too dry it will expand or contract and the plastic will curl to follow it. Double-sleeving using a Perfect Fit Sealable inner sleeve shortly after the foil card leaves the booster pack can help keep a constant humidity around the card, which can help mitigate curling.
MTG - How To Keep Your Foil Cards From Curling / Bending / Warping - Magic: The Gathering
Many Magic: The Gathering players ask the question: How
How To FIX CURLED Foils TCG Cards: Magic the Gathering, Flesh and Blood
MTG
Fix curled bent and pringled trading cards
Fix
