These are candle holders . There is no INSIDE to paint. I used Elmer's Glue poured into a cup and then added small amounts of Wilton's Food Coloring until I liked the color Then I used a soft paint brush . It's amazing after it dries it really dries transparent. You don't need a sealer. If you do it for a vase you still need to paint the outside because it is not water proof. Hope that helps!
Mix Elmer's glue with food coloring and paint it on to any glass to make it look like seaglass when dry In a bowl add one teaspoon glue, three drops food coloring, and 1 1/2 teaspoon water. Might want to try Wilton food color.
Epsom Salt Mason Jars We did something similar for Christmas. Glade Christmas candle with the colored glass, brush on diluted Elmers glue, roll in epsom salt and glitter mix for sparkly snow. We used green and red glitter since they were leftover on the table from another craft but silver and/or iridescent glitter would be beautiful.