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Any problems incurred when working with decals are usually due to poor application technique. Remember the following:
• Always wipe the item down with a damp cloth
• Use clean, warm water to soak decals
• Squeegee the item well to remove all air bubbles and to ensure good adhesion
• Dry the item 24 hours before firing
Although rare, firing problems can usually be solved by re-firing the item one cone hotter and making sure there is adequate air circulation within the kiln.
Bad decals are extremely rare. They may have been contaminated during the printing process, there may be a compatibility problem between the decal and the glaze, or the covercoat may be too heavy or too thin.