Yea... those blacks. Looks cloudy when overlammed.
I'd push it back to the material manufacturer/distributor... especially if they OK the film for printing on the UCJV.
What materials are you printing on?
I do not know why Mimaki would suggest the use of heat assist on an overlam. Heat assist is not going to help with long term bonding.
Heat assist is about wet-out and environmental condition. With UV inks, it's mostly about the bond of the laminate's adhesive to the UV ink.
Besides, heat on a cast overlam is the last thing you want to do. Can you say STRETCH.
These two overlaminates are made for UV printable applications.
The Oraguard 215DU PVC overlam is great for flat applications. 3 mil calendared. This is not going to help you on this one, but if you have some flat work....
https://www.orafol.com/en/americas/products/oraguard-215du
The Avery DOL 4400 UV is a Cast PVC overlam made for UV prints... but it is only available in the EU. It might be worth asking about this.
I do note that the standard 3M wrap overlam products (8518/8519/8520) are listed as UV-compatible, but that seems like a broad statement.
I'll look into this at Printing United. It's an interesting topic.
~E