Automatic Sprinklers Impairments: Painted Sprinklers
Painting a sprinkler can slow down the response to heat, interfere with free movement of the parts, and make the sprinkler inoperative.
Dried paint can seal the cap to the orifice, preventing the flow of water. Paint on a fusible link can prevent the solder from melting at the specified temperature.
The only way to fix a painted sprinkler is to replace it with a new sprinkler with the same characteristics.
Painted sprinkler head