- Cut a square of tissue paper a bit smaller than the coaster. Apply a light coat of decoupage medium to one side of a leaf with a sponge brush. Gently press the leaf, wet side down, onto a paper square. Repeat for each leaf. Trim the leaves even with the edges of the paper square. Apply a light coat of decoupage medium to the leaf side of the square. Press the wet side of the square onto the bottom of the glass coaster. Apply a coat of decoupage medium over the bottom of the coaster, carefully covering the edges of the paper; let the medium dry.
- Cover the top of the coaster with adhesive label paper. Use a crafts knife to cut the paper even with the edges of the coaster. Cut a square in the center of the adhered paper with the crafts knife and a metal straightedge, using the edges of the decoupage tissue paper as a guide. Remove the outer areas of the adhesive paper, leaving a square centered on the coaster. Apply strips of masking tape to cover the edges of the coaster
- Spray the top of the coaster with the Krylon glass frosting spray, following the manufacturer's instructions. Repeat for the desired number of coats, letting dry between coats. Remove the label paper and masking tape.
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