I used to make this sorta stuff, and the clear lenses for the sand scorcher. I used RTV silicone stuff to make moulds and alumilite 2-part liquid plastic for the opaque stuff, not sure what I used for the clear stuff. The best way to use the alumilite I found was to microwave it - instead of 3minute curing time tho it fell to about 30 seconds but the microwave got all the bubbles out so I got better results as long as I worked extremely quickly.
I reproduced stuff like rear light pods and numberplates for the sand scorcher.. only fairly small stuff.
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