Powder Coating Explained for Furniture Buyers

What the coating line actually does

Powder coating puts a dry polymer powder onto a prepared steel part with an electrostatic charge, then cures it in an oven so it flows into a continuous film. It gives a harder, thicker and more even finish than wet paint, with no solvent to flash off.

The finish quality is decided before the powder is applied. Surface preparation — degreasing, rinsing and pre-treatment — is the step that decides whether the coating stays on.

Colour is easy consistency is not

Matching a colour once is straightforward. Matching it across three production runs and two years is a process-control question.

If colour consistency matters to your range, order the items that must match in the same coating batch, and keep the approved sample as the reference.

Coating is not weatherproofing

A powder-coated frame is not automatically an outdoor product. Outdoor durability depends on the pre-treatment, the powder chemistry, the film thickness and how the part drains.

Before you list a product as outdoor or garden furniture, ask the factory directly whether that model is specified for outdoor use — and get the answer in writing.

The three questions to ask

What pre-treatment does this model get? What film thickness is specified? What salt-spray performance can you confirm for this specification?

If your market expects a specific salt-spray figure, state it at quotation rather than after the first container lands.

Where coating fails in transit

Coating damage is rarely a coating fault. It is a packing fault: two coated parts rubbing against each other in a carton for six weeks.

Specify which faces touch and how they are separated on the packing drawing. This is the cheapest quality improvement available in metal furniture.