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Why we powder coat by default (and when paint is still the right call)

· 3 min read
Suhesma Sri
Sales · Deltisan Engineering

Finished and ready for dispatch

When customers don't specify a finish, our default for steel parts is powder coat. It's not because we have a powder line and a hammer looking for a nail — it's because, for most use cases, powder simply lasts longer and looks better. Here's the short version.

What powder coat actually is​

Powder coat is dry pigment electrostatically applied to a clean part, then baked in an oven so the powder melts and fuses into a continuous, durable film. The end result is a thicker, harder coating than most wet paints — roughly 60 to 80 microns is normal, vs 25 to 50 microns for a typical industrial paint job.

Why we like it​

A few things make powder coat the right default for industrial parts:

  • Durability. It resists chipping, scratching, and impact better than most wet paints. For brackets, frames, and enclosures that get handled, mounted, and bolted into things, that matters.
  • Corrosion resistance. Combined with a good pre-treatment (we phosphate as standard), powder coat gives meaningful corrosion protection — especially important for parts that live outdoors or in humid environments.
  • Uniformity. The electrostatic process gets the powder into corners and edges that wet paint tends to thin out. The whole part is the same thickness.
  • Environmental. No VOCs. Overspray can be reclaimed.
  • Cost. For batch quantities, powder is genuinely cheaper than a comparably durable wet system.

When wet paint is still the right call​

Powder coat is the default — not the only option. Wet paint wins when:

  • The part is too large for our oven. We have limits, and so does any shop. Site-painted structures stay site-painted.
  • The part is heat-sensitive — anything with already-applied seals, certain plastics, or pre-finished hardware that can't go to 200 °C.
  • You need a specific custom colour or texture that's only available in a wet system. We can match almost anything in powder, but not absolutely everything.
  • You need easy field touch-up later. Powder is hard to repair on site; wet paint can be touched up with a brush.

The boring truth​

For 90% of fabricated steel parts, powder is the better answer. It's tougher, looks more even, and — once you account for rework and longevity — costs less per year of service. We default to it because, after enough years on the shop floor, you stop arguing with what works.