Painting The Inside of a Wine Bottle

First make sure your wine bottle is clean. Pour a cup of plain water in it. Spray paint a color on top of water inside. Swish it around and pour water out slowly while turning it round & round to create a basic pattern. Let dry. If you want marbleized colors : then, pour water in again. Add two different colors (or more) sprayed into bottle. While swishing around, pour water slowly while turning. Dry, continue until you are pleased.Dry...Final is to pour some polyurethane in and turn bottle all different ways to cover all paint. Let stand a day or two drying time. Will now be waterproof! Have made many, beautiful craft!

I have never done this. Maybe you could get some paint and put quite a bit inside the bottle, coat the inside by turning the bottle and let it dry and do a second coat. Hope this helps.