How to Seal Acrylic Paint on Glass

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While acrylic paint can completely change the look of a glass surface -- such as a wine glass, mason jar or ornament -- the paint itself can easily come off with everyday use. Applying a sealant over the painted glass helps to prevent the paint from chipping, fading and wearing off. Acrylic sealant is available in spray-on and brush-on forms. However, you should choose a sealant, polyurethane coating or polyurethane varnish with a glossy finish that is safe for use on glass surfaces. Avoid matte finishes, which will affect the natural glossy look of the glass.

Things You'll Need

  • Spray-on glossy acrylic sealant or clear polyurethane coating
  • Glossy polyurethane varnish
  • Paintbrush

Spray-on Sealant

  • Shake the spray-on sealant can for several seconds until well mixed.

  • Remove the lid from the can. Hold the can about 12 inches away from the glass surface.

  • Spray the entire surface lightly with the sealant using a sweeping, back-and-forth motion. Avoid applying the sealant in a continuous spray.

  • Apply an additional one or two light coats to the surface, allowing the sealant to dry about 15 minutes between each coats.

  • Place the glass in an undisturbed area where is can dry completely for at least 24 hours.

Brush-on Sealant

  • Dip a clean paintbrush into the varnish. Hold the brush over the varnish container. Allow the excess varnish to drip off the brush and back into the container.

  • Brush on the varnish covering the entire painted surface with a light layer of the sealant. Let the varnish dry for about an hour.

  • Apply an additional one to two light coats of the varnish, allowing it to dry after each application.

  • Allow the glass to dry for at least 24 hours in an area where it won’t be disturbed.

Tips & Warnings

  • Since every acrylic sealant is different, make sure to always read and follow the instructions found on the bottle or can.
  • Work in a well-ventilated or outdoor location to prevent the buildup of potentially dangerous fumes.
  • Make sure the paint on the glass is completely dry and the surface is clean and dust free before applying the sealant.
  • Even after sealing, painting glass wear -- such as cups and wine glasses -- should only be hand washed and never placed in the dishwasher.

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References

  • Photo Credit Christopher Brignell/iStock/Getty Images
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