Fixing a silicone resin mould depends on what kind of damage it has. Sometimes it might be easier to replace than fix but here’s a guide based on some common problems.

---

Common Silicone Mould Problems & Fixes:

1. Small Tears or Cracks

Fix with: Silicone Adhesive / Silicone Caulk

Steps:

• Clean the mould thoroughly (use mild soap and water, then dry).
• Apply a clear silicone adhesive (like this one from amazon) along the tear.
• Press the tear together and tape it in place (optional).
• Let it cure for 12–24 hours.
• Remove any excess silicone carefully with a blade or small scissors.
  

---

2. Surface Imperfections (pits, scratches)

Fix with: Liquid Silicone

Steps:

• Mix a small batch of liquid (mould making) silicone. You can get reasonably priced bottles like this one from Amazon.
• Use a toothpick or brush to dab it into the pits.
• Let it self-level, then cure completely.
• Trim off any raised excess.
  

---

3. Hole or Missing Chunk

Fix with: Pour or mold silicone into shape

Steps:

• Use modelling clay to create a small temporary “form” around the missing section.
• Pour in liquid silicone to fill the gap.
• Let it cure, then trim and blend the edges with a sharp blade.
  

---

4. Mould Losing Shape

If it’s warped, try gently heating it (e.g., placing in hot water) and reshaping it. Be careful not to melt it – silicone can tolerate heat, but not boiling or direct flame.

While still warm, you can fill with rice to help mould its shape and let it cool.

---

Bonus Tips:

• Always clean with soap + water and isopropyl alcohol before repairing.
• Make sure you’re using platinum-cure silicone to repair platinum silicone moulds (tin-cure + platinum = curing issues).
• Use baby powder or corn starch to dust repaired areas before next resin pour if it feels sticky.

---

If you find your mould is beyond repair and you’re looking to replace it, check out our discounts page to view lots of money off codes for high quality mould suppliers.