Powder colours vs woodgrain transfer finishes
The finish on an aluminium frame is a powder coat, and on top of that it can be a solid colour or a woodgrain. The solid colour is the powder itself, in any RAL or a custom shade; the woodgrain is a sublimation transfer, a film applied over a powder base and baked in, so it is a pattern on a coating, not bare aluminium. The choice is aesthetic and durable both: the solid is the tougher finish, the woodgrain the warmer look, and the specification states which basecoat and which warranty the elevation carries.
How each is made
Powder coating is applied as a dry powder and baked into a film — durable, uniform, and available in almost any colour, including the matt and textured finishes a designer asks for. The woodgrain is a transfer: the profile is powder-coated first, then a printed film is applied and the whole is baked so the pattern sinks into the coat. It is the same coating underneath, so the woodgrain is a decoration on the powder, not a different material.
Durability and the exterior
The solid powder coat is the more durable finish on an exposed elevation, because the film is uniform and the surface has no pattern to hold dirt or break the light. The woodgrain is warm and convincing, and modern transfers hold colour well, but on a very exposed or coastal elevation the pattern is the part that ages: the film can fade or chalk faster than a plain coat, and the specification checks the warranty for the elevation, not just for the colour.
Where each reads right
- Solid powder for the modern build and the exterior that has to take the weather, on a coastal or high-UV elevation.
- Woodgrain transfer for the timber-look interior, or the elevation where the joinery reads as timber, over an aluminium frame so the maintenance of timber is not carried.
- Both over the same aluminium: the frame, the glazing and the thermal break do not change with the finish.
- The basecoat matters — a quality powder under the woodgrain is what the transfer warranty stands on.
What to put on the schedule
- The colour system: RAL or a custom shade for the solid, or the timber pattern for the transfer.
- The finish class and the warranty the elevation requires, stated per elevation where the exposure differs.
- The basecoat under a woodgrain, because the transfer is only as good as the powder under it.
- The exterior or interior position, because the same colour reads differently and the durability differs.
Questions
A modern transfer holds colour well, but on a very exposed or coastal elevation it can age faster than a plain coat, so the warranty is checked for the elevation.