Painted or Anodized Aluminum Coil Which Finish to Specify

One Is a Layer On Top the Other Is Grown From Within

Paint is a film applied to the surface. An anodic layer is oxide grown electrochemically out of the aluminum itself. That single difference explains most of what follows: paint can peel and anodizing cannot, but paint can be any colour and anodizing cannot.

Choose Painted for Colour and Cost

Painted coil reaches colours anodizing has no route to, matches a specified reference closely, and costs less per square metre. For facade cassettes, ceiling tiles and large architectural areas, it is usually the right answer.

Choose Anodized for Wear and a Metallic Look

Anodizing gives a harder surface that survives handling, cleaning and edge abrasion, and it keeps a metallic appearance rather than covering it. Bezels, trim and anything a user touches repeatedly are where it earns its price.

Both Are Formed After Finishing

That is the point of buying finished coil, and it is also the constraint. Alloy, temper and bend radius have to be matched to the finish before the order, because a coating that cracks on the roll former cannot be fixed afterwards. Anodized coil generally needs a more open radius than painted.

Shade Behaves Differently on the Two

A painted colour is the same on any substrate. An anodized shade depends on the alloy underneath, because the layer is grown from it. So an anodized sample should always be approved in the alloy the part will actually use.