How to Repair a Hairline Crack in Porcelain Bisque

Written by jennifer eblin
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Porcelain bisque is an extremely delicate form of porcelain used in the manufacture of decorative china and other household items. Dropping the porcelain piece may result in a small crack, known as a hairline crack. In some cases, even extreme changes in weather and climate can cause a hairline crack as the porcelain expands and contracts. Regardless of its origins, unless you repair the hairline crack in your porcelain item, the crack will remain fairly visible.

Skill level:
Moderate

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Things you need

  • Caulk
  • Paintbrush
  • Damp paper towels
  • Fine grit sandpaper
  • Acrylic paint
  • Old newspaper
  • Small paintbrush
  • Clear glaze

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Instructions

  1. 1

    Apply a small amount of caulk to the hairline crack with the paintbrush. Paint the product right over the hairline crack, filling the crack, and then wipe down the porcelain with a damp paper towel to remove any excess caulk.

  2. 2

    Examine the hairline crack for any signs of imperfections after the caulk dries. If you wiped away all of the excess caulk, you shouldn't notice a problem. If you missed any of the caulk, it may have an uneven look and stick up over the crack. Lightly rub the caulked area with sandpaper to remove the excess.

  3. 3

    Match an acrylic-based paint to the colour of the porcelain bisque.

  4. 4

    Squeeze a small amount of the paint onto a piece of old newspaper. Dip a small paintbrush into the paint and apply the paint along the repaired area.

  5. 5

    Wait for the first layer of acrylic paint to completely dry. Compare the colour on top of the hairline crack with the colour of the rest of the piece and add more layers of paint as needed until you have a correct colour match.

  6. 6

    Apply a layer of clear glaze to the top of the acrylic paint only if the rest of the piece has a shiny look. Once you apply the glaze, rub the edges of the application slightly with your fingers to blend the new glaze in with the existing glaze.

Tips and warnings

  • Clear epoxy can be used in place of the caulk.
  • For antiques or valuable pieces, consult a professional for help. Home repairs of this type can significantly lower the value of the porcelain bisque piece.

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