For outdoor use in Utah (lots of sun/UV, winter freeze–thaw, and sometimes road salt in some areas), the best metal coatings are those that combine strong corrosion protection, UV/stain resistance, and good adhesion. Powder Coated Outdoor Spiral Staircase for a client in Utah Best coating types for outdoor use in Utah 1) Hot-dip galvanizing (HDG / zinc) — best budget-friendly for steel that should last If you’re coating steel and want excellent corrosion protection outdoors,