Powder Coat or Galvanizing for Central Texas

Powder coat does one job: it seals bare steel behind a baked plastic skin so moisture never touches the metal. Every teardown metal gates georgetown three word wednesday has logged shows the same thing, that rust on a gate in Georgetown, TX starts at a chip or a weld, not across the open face of a rail. The finish is only as good as its weakest edge.

What does powder coat protect against?

Powder coat protects against moisture and sun on a clean, abrasive-blasted surface. The powder is sprayed on with an electric charge and baked until it flows into a hard film. It looks even, it comes in many colors and it holds up to Texas sun if the resin is rated for exterior use. A chip that reaches the steel lets rust creep under the film.

What does galvanizing do differently?

Galvanizing coats the steel in zinc, and the zinc corrodes first so the steel stays intact. A hot-dip galvanized frame protects the inside of tubing as well as the outside, which paint and powder cannot reach. The surface is gray and slightly rough, and it can be powder coated over for color. A weld made after galvanizing has to be touched up with zinc-rich paint.

Where does primer fit in?

Primer is the base layer between bare steel and a topcoat, and a zinc-rich primer gives some of the sacrificial protection of galvanizing. A gate that is primed and painted is the easiest to touch up on site, and the finish can be renewed every few years without removing the gate. A primer that was applied over mill scale or rust peels in sheets.

How does humid Central Texas change the choice?

Humidity near the San Gabriel River and Lake Georgetown keeps steel damp for hours after dawn, and condensation collects at the bottoms of posts and rails. Tubing with open ends fills with water unless it is capped or drilled to drain. A galvanized post with a powder coat topcoat gives two layers where water collects most.

Which wears out first at the weld?

The weld is the weak point on every finish. A bead has an uneven surface, and the heat burns the coating on both sides of the joint. Welds are ground smooth before finishing so the coat covers an even edge, and a seal of caulk or paint over the joint stops water from wicking in. A gate with ground and sealed welds outlasts one with raw beads by a wide margin.

What maintenance does each finish need?

A powder coated gate needs washing and an annual check for chips, and a chip is touched up the same week. A galvanized gate with no topcoat needs very little but fades to a dull gray. A painted gate gets a light sanding and fresh topcoat when the sheen goes flat. In every case, the rail bottoms and hinge areas are the first places to look.