Preparing Spot UV files
Spot UV is a great way to make certain areas of you design really pop. You will need to create your spot UV file(s). For each side that has spot UV you will create another layer in your artwork and whichever areas you want to be glossy you will make those areas solid black (c 0, m 0, y 0, k 100). You can then export that layer by itself and save as a pdf.