For products with special finishes (gold foil, silver foil, or 3D varnish), it is not possible to apply that finish along cutting or folding lines. The cutting and folding operations (which take place after the application of the polymer that forms the base of the finishing), would, in fact, make the finishes too fragile and prone to damage or peeling.
Here's an example of printed product with special finish applied over the fold lines:
To avoid this result, always keep the elements with special finishes at least 1 mm away from fold lines and 3 mm away from cut lines in your file.
Here’s a correctly created file and the corresponding print result:
If you choose special finishes (gold foil, silver foil, or 3D varnish), always keep the elements you want to highlight with this effect at least 1 mm away from fold lines and 3 mm away from cut lines in your file to ensure a good result.
If you have any further questions, please do not hesitate to contact us; we will be happy to assist you.