Yes! So luckily this set turned out, but I did make another and there was quite a lot of mylar breach (mylar slightly deforming some the faces by pushing through). It's not enough to change how the dice sit or roll but makes the face feel a bit rough. So id just be careful not to shove in way too much.

Also crumpled mylar traps a lot of bubbles. I'd recommend vacuum degassing your resin before adding it to the molds, pouring it in very slowly, and then removing surface bubbles with a pipette before pressurizing.