Polyurea

What's that about?

Polyurethane and polyurea both tend to handle high abrasion areas well.

Polyurea specifically is a strong option for grit chambers because you need both abrasion resistance and chemical resistance in that one spot, and it covers both.

What about zinc-rich coatings? I hear those mentioned for marine settings a lot.

They're great for corrosion protection in marine or salt-heavy environments, no question.