Compressor Protection from Salt (ocean front housing)

[missfixit]

Any suggestions for coating that may be used in ocean front settings. The compressors serving residential homes are exposed to tropical weather conditions, heavy rain, extreme sun, salt, wind. Average lifetime is 4 years. Recently I was recommended a coating called "Thermoguard" but I cannot find any information on it or how to apply it. Unfortunately a lot of products and suggestions here are just, well useless.