Got a backpack out of the loft. Some what looked like copper sulphate(?) around the zips.
The zips were absolutely stuck fast and took ages with some plusgas and wiggling to break free.
I've lubbed them with silicone grease.
Question is: why and has anyone seen this before?
Probably some kind of nickel compound from the metal in the zip.
@Five-Hats started
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Got a backpack out of the loft. Some what looked like copper sulphate(?) around the zips.
The zips were absolutely stuck fast and took ages with some plusgas and wiggling to break free.
I've lubbed them with silicone grease.
Question is: why and has anyone seen this before?