Mold materiel that is safe for the oven and will not stick to lexan/PETG? Answered
I'm making a helmet, and I hit a wall: I need to make the visor. I have the helmet made, and I need to make a negative mold of the visor, which I would put in the oven, with the PETG/lexan to "melt" the plastic to form over the negative mold in the home oven.
But, again, issue is what mold materiel can I use which will be safe up to 300 degree Fahrenheit and not stick to a semi-melted plastic?