If you are adding some Spot UV art to your folder, there are a few things to keep in mind.
Vectors only for Spot UV: Spot UV elements must be supplied in vector format; any text shapes to be spot-varnished must be converted to paths/outlines.
Design with a little tolerance for mis-registration: The UV varnish is applied using a screen printing process, and registration with print can vary by ±2 pt.
If you are aiming to cover a printed shape having a hard edge, then the Spot UV shape should overlap the printed edge by 2pt, to allow for any inherent variations in registration. Shapes meeting the edge of the page, should be treated like backgrounds - bleed them off the very edge of the document.
Don’t try to align fine detail: Spot UV is not suited to alignment with fine detail, such as small type, or shapes with thin lines. Avoid lines thinner than 1 mm, and avoid reversed-out lines thinner than 2 mm.
Avoid large Spot UV areas over the edge: Avoid large solid areas of Spot UV bleeding to the edge as chipping and flaking can occur once the job has been guillotined or die-cut.
Solid varnish only, no tints: Spot UV cannot be specified as a gradient or tint, i.e. a changing tint from 100% to 0% over an area of artwork.