How To Glue Trim to a Mirror


Trim is often glued to mirrors to provide a more finished look to a mirror installation. You can bring the mirror more in keeping with the style of your room, matching the molding already present. Gluing the trim is a quick project to complete, primarily involving cutting the trim to size for attachment to an already installed mirror. Trim can add new beauty to old mirrors.

Things You'll Need

  • Mirror
  • Construction adhesive
  • Wood screws
  • Screwdriver
  • Trim
  • Table saw
  • Paint
  • Paintbrush
  • Sandpaper
  • Masking tape
  • Tape measure
  • Nail set
  • Wood putty
  • Measure the thickness of the mirror. Purchase trim that’s thicker than the measurement so that it can be cut to overlap the mirror. Choose a wood that goes well with your room’s décor to use as trim. If possible, purchase molding that has been rabbeted to act as your trim to save time in cutting it yourself. Rabbeted molding is molding with a lip cut for placement over surfaces of different height. Get a trim with a rabbet the same thickness of your mirror.

  • Rabbet the corner blocks for your mirror, if necessary, so they overlap the mirror corner while laying flat on the wall. Cut the rabbet section the same thickness as the mirror in the corner of your corner block that will be placed over the mirror’s surface using a router. Sand this cut smooth and then paint the corner blocks of the trim the desired color. Apply paint to both sides as the mirror will reflect the rear of the blocks once mounted.

  • Place a layer of glue to the rear of the corner blocks and then glue them in place at the mirror corners, covering them with the cut portions. Tape the corner blocks in place to hold them while the glue sets.

  • Use a tape measure to determine the distance between the blocks and cut the trim lengths to fit the space between.

  • Rabbet the trim along the edge which fits the mirror to create a lip that rests against the mirror’s surface while the rest of the molding rests against the wall, using the same method you used for the corner blocks. Paint both sides of the trim.

  • Mount the trim in place, gluing the rabbeted area to the mirror surface and then nailing the trim to the wall using finish nails.

  • Countersink the finish nails using a nail set to drive the nail slightly beneath the surface of the trim. Apply wood putty to the nail hole and allow it to dry completely before painting the putty the same color as the trim.

Tips & Warnings

  • Paint the trim two weeks in advance to reduce the chances of a negative reaction between the wood and the glue used to place the wood onto the mirror.

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  • Photo Credit tape measure 1 image by Martin Grice from
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