Final answer:
True, overlapping Fusion 4000 adhesive film can cause noticeable creases in the artwork, which is detrimental to the aesthetic quality of the art piece.
Step-by-step explanation:
The statement 'Never overlap Fusion 4000 as it will cause noticeable creases in the artwork.' is true. Fusion 4000 is a type of adhesive film that is commonly used in mounting artwork. When you overlap this material, it can create a thickened area that will show as a raised line or crease through the artwork that's been mounted. This can detract from the visual appeal of the art and is especially troublesome when dealing with delicate pieces or when the artwork will be displayed under direct lighting, which can enhance the visibility of such imperfections. Therefore, careful application is necessary to avoid overlaps and ensure a seamless finish.