Short or long waviness of powder coating, noticeable only after curing.
The film thickness may be too thick or thin
Increase or decrease the film’s thickness to achieve the recommended DFT from the Technical Data Sheet,
Heat up cycle of parts too slow, causing the melt viscosity of the coating to be high and restricting the flow out of the coating before it gels.
Determine heat up curve and increase if necessary
Heat up cycle too fast, causing the coating to react and gel too quickly and not allowing sufficient time for the coating to melt and flow out. Particuarly noticeable in highly reactive systems such as low bake or fast-cure coatings.
Reduce the heat build up on the parts.
Some coatings, most notably coatings designed to improve corner covering or edge protection will have their melt viscosity increased. This has the side-effect of increasing the waviness of the coating.
Where edge coverage is important, a decision must be made on how much of the coating's smoothness can be sacrificed. Where a highly smooth finish is required, but edge coverage important, a solution is to switch to a dual coat system, with a powder primer to provide the edge coverage.
Textured substrate surface, perhaps blasted steel.
Reduce the blast profile or increase the powder DFT.
Different coatings vary in amount of orange peel properties
Contact us for information and recommendations.