Compound 7 Silicon Sealant 
for Waterproof Watches
 watch case sealant and stem packing agent. No leaking in water or air even under the most extreme conditions. temperatures from -280F to 485F.

The name says it all.  If you open the caseback of a waterproof watch, this is the ideal way to treat the gaskets before closing it.  Dramatically prolongs gasket life and helps promote a watertight seal - impervious to seawater.

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