Foil Coverage should be no more than 30% of the artwork , otherwise the foil will be wavy and won’t look good. The only time a 50% coverage is acceptable is with patterns, thin strokes or small shapes. Ideally, the size of the area, shape or image covered with raised foil should not exceed 1in x 1in. Make sure that your raised foil mask file has been created in a vector based program such as Adobe Illustrator. Failure to do so will result in poor quality of the finished piece.