How to fill countertop seams

Written by larry simmons
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How to fill countertop seams
Give your counters a seamless illusion by filling the seams with tinted resin. (Jupiterimages/Comstock/Getty Images)

After installing a countertop, the seam between countertop pieces can create an area that tends to detract from the overall look of the counter. It breaks up the counter's appearance, drawing the eye away from the counter's surface. This can be minimised, however, by the way you fill the seam. Instead of using a single-colour grout or caulk, you can replicate the look of the counter's surface along the length of the seam using a polyester-based tinted resin. By duplicating the surface of the counter throughout the seam, you lower the visual impact of the seam. The effect blends the seam smoothly into the surface, creating the appearance of a seamless counter regardless of the number of sections making up the piece.

Skill level:
Moderate

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Things you need

  • Masking tape
  • Utility knife
  • Polyester-based resin
  • Resin-colouring paste kit
  • Putty knife
  • Cup
  • Pumice stone

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Instructions

  1. 1

    Place a strip of masking tape over the seam, then use a utility knife to cut through the tape, exposing the seam only. Place a second strip of tape on the bottom of the countertop along the seam to prevent the resin from leaking through.

  2. 2

    Pour a small amount of polyester-based resin into a cup. Use a resin-colouring paste kit to tint the resin the same colour as the countertop. Mix colours into the resin using a putty knife to change the colours until you reach a match with the countertop. If the countertop is made of multiple colours, make a small batch of the resin in several colours to match.

  3. 3

    Add the hardener to the resin according to the mixing ratio suggested by the resin manufacturer. Stir the mix thoroughly with the putty knife. Mix only one colour at a time, not moving on to the next until you've used the first, due to the short working time of the resin. Begin with the most common colour of the countertop.

  4. 4

    Add the most common colour type into the seam, using the putty knife to pack the resin into place. Skip small sections for adding multiple colours if the countertop is made of multiple colours.

  5. 5

    Mix and add the second-most-common colour, then the third, working your way down the list in an attempt to re-create the look of the rest of the countertop. Continue until the seam is filled up to the surface of the counter.

  6. 6

    Remove the masking tape from the countertop and wait 30 minutes for the polyester resin to dry.

  7. 7

    Sand the resin smooth using a pumice stone to smooth the seam until it matches the surface of the countertop in texture. Rub the stone over the seam in small circles along the length of the seam until you achieve the desired results.

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