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How to Repair a Leaking Film Developing Tank

Developing Tank Leak Repair

How to Repair a Leaking Film Developing Tank

If you’re a photographer, you know that developing tanks are essential for processing film. But what happens when your developing tank starts to leak? Don’t worry, it seems to be a common problem, and you can fix it yourself with a few simple steps.

Here’s what you’ll need:

  • A leaking developing tank
  • Silicone sealant
  • Masking tape
  • Water and washing liquid solution in small cup
  • A clean cloth


  1. Clean the developing tank thoroughly.
  2. Apply a strip of masking tape along the bottom of the red band on the developing tank.
  3. Apply another strip of masking tape about 5mm below the red band.
  4. Squeeze a bead of silicone sealant in between the two strips of masking tape.
  5. Smooth out the bead of silicone sealant with a wet finger dipped in water and washing liquid solution.
  6. Allow the silicone sealant to dry completely.

Once the silicone sealant has dried, your developing tank will be leak-proof. You can now use it to develop film without worry.

Developing Tank Repair
Developing Tank Fix
Developing Tank No More Leaks

Here are some additional tips for repairing a leaking developing tank:

  • Make sure the developing tank is clean before you start. Any dirt or debris can interfere with the bonding of the silicone sealant.
  • Apply the silicone sealant evenly. A thick bead of silicone sealant will take longer to dry and may not be as effective as a thin bead.
  • Smooth out the silicone sealant with your finger. This will help to create a smooth, even surface that will be less likely to leak.
  • Allow the silicone sealant to dry completely before using the developing tank. This will ensure that the sealant is fully cured and that the developing tank is leak-proof.

By following these simple steps, you can easily repair a leaking developing tank and get back to developing film.

3 thoughts on “How to Repair a Leaking Film Developing Tank

  1. This is excellent, i have exactly the same problem with one of these tanks :-/ this is an excellent idea and i will be doing the same with mine 🙂 it even looks good 😉 well done 🙂

    Dave Webster.

    1. Thank you Dave for stopping by to comment and for your kind words. The tank is still working leak free and it has had much use since I did this, certainly the way to go.

  2. Thanks! I have the same problem but with another tank, but i will use your idea

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