What's the different between galvanized coat, metal zinc coat, tar and epoxy coating?

all of this coats are protect metal against corrosion and have good appearance

Epoxy can be used cold by mixing two COMPONENTS

tar can be used cold or hot or mixing with epoxy.

galvanized and metal zinc are electerical coat

First of all, we must know what would be coat and where will it use couse some material coat is a toxic material we can't used it with food or drinking water process.

2nd we must know the enviroment against metal it's an agressive or not to choose the best method to apply.

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Galvanized Coat is Coating by molten Zinc and let the molten then to sloidify - The most popular Galvanizing method is dipping & Molten Spraying (atomization)

Metal Zinc Coat is Coating by solid powder zinc spray. They sold as spray cans

Epoxy Coating is by using coating polymers