The shelf life of a sealant after opening is generally between 12 and 24 months, provided certain precautions are taken.

To maximise its shelf life:

1. Store the sealant in a cool, dry place away from direct light. Avoid extreme temperatures that could alter its composition.
2. Make sure the container is tightly closed after each use to avoid contact with air, which can cause the product to harden or degrade.
3. Before reusing an opened glass cleaner, check its condition. If the product has lumps, an altered texture or an unusual odour, it is best not to use it.
4. Note that water-based sealants generally have a shorter shelf life than solvent-based ones.

By following these recommendations, you can extend the life of your sealant while ensuring its effectiveness in future applications. It is important to always check the condition of the product before using it, even if it has not exceeded the recommended shelf life.