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How to repair piping or welting on leather or vinyl upholstery?

Welting or piping, the cord trim on upholstery, can be a tricky repair due to the curves involved. The key is to avoid getting any filler resin in the seams, which, if allowed to cure, will obscure the shadow line and create a patched look.

Here’s how to repair a hole in piping or welting:

  1. If the damage to the piping exposes a plastic cord, and the leather or vinyl floats freely over it, a subpatch is recommended to close the hole and maintain separation between these elements. You can also use a flexible glue to adhere them together, but this may put stress on the repair.
  2. Apply a small blob of Soft Filler to the hole. Smooth it around as evenly as you can using a palette knife.
  3. Use a flexible business card to smooth the filler across the gouge(s). Quickly remove any excess from seams, and feather the edges.
  4. Allow to cure.
  5. Repeat steps 2-4 until the gouged area feels even.
  6. Apply a little more filler to the area and smooth.
  7. Wearing a glove, trace the piping with the thumb and index finger to mimic the round contour as much as possible. Remove excess.
  8. Allow to cure.
  9. Use rubbing alcohol to feather or smooth any edges.
  10. Apply a thin texturizing coat if necessary.
  11. Allow to cure.
  12. Apply color and clear finish.

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