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Can you please suggest a method for making a hollow cylinder mold that is open ended with approx. 1/2 inch air space in the wall of the cylinder. I would like the mold to make a completed diameter measurement of 4" minimum 4.5" max- with a 1/2" wall, the hollow center space would measure approx 3" minimum. My goal is to embed similar, not identical , objects in clear resin in a tube shape. I can drill out the bottom of the resin if I have to as long as it is not too thick as I don't like wasting the resin. Thank you for any suggestions.
You could have simply sanded the plastic with a piece of steel wool or fine sandpaper to frost the plastic Paper isn't a good idea anyway unless you use cool led lighting. Regular light bulbs get way too hot and placed that close to the paper, could be a fire hazard.