The tunnel portholes we chose are made by A.I.M. Mfg. They are cast plaster and need to be painted. The same acrylic paint we used on the rocks is used.
To add realism we "Dry Brushed" white after the colors had dried. This is done by dipping the tip of your brush into white paint and brushing almost all the paint out on a scrap of paper. Then briskly brush over the porthole.
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