Dust spray problem in the wood finishing
Dust spray is the rough surfaces caused by dust particles that attach to the finishing surface. In some severe cases the dust spray can appear as a surface with uneven gloss that can be looked like zebra. A thin dust spray in the unexposed part can be fixed by doing scuff sanding on the rough surfaces. But a severe dust spray on the wide and face surface especially with a high gloss, only can be revised by re sanding and re coat the whole surface.
The dust spray problem is mainly caused by the poor spray technique. The application of paint, top coat or sealer always need a wet and evenly coat layer to the overall surfaces. The uneven coat (dry spray) will produce a rough and uneven surface since there are dust attached to the surface.
The best way to avoid the problem of dust spray, is by doing a good spray technique. A proper spray technique will produce a wet coating layer to the entire surface evenly and result to an even and smooth finish. But even though the spray technique is seem as the main factor, in fact there are also some other factors which should be carried out to remedy the dust spray problem. There are some other factors that need to be considered such as: finishing material quality, spray equipment, the shape and size of the product and the finishing room.
Here are the things that must be considered to avoid dust spray:
Instead of the proper viscosity of the finishing material also requires a proper drying time to avoid dust spray. A material layer should be wet quite long time to make sure the layer have enough time to receive the material dust spray during a spraying process. The wet layer will let the dust spray stuck is dissolved and merged with the surface layer and does not generate rough surface. Ideally a finishing layer of the first stroke spray gun is still wet until the last stroke is done. The coating layer must be remain wet until the last stroke of the spray gun movement, so the dust spray from the spray gun movement will be able to be accepted and mixed by surface finishing layer without causing a rough surface.
For a wide and big surface for example such as: big cupboard, or wide and long table it is sometimes rather difficult to be fulfilled. We may need to adjust the finishing material to dry slower. Add retarder to the mixture to slower the material drying time when we spray to the big objects.But we cannot set the drying time too long. Too long drying time will slower the finishing process. Too long drying time will also risk to affect the gloss and get problem with dust.
The dust spray problem is mainly caused by the poor spray technique. The application of paint, top coat or sealer always need a wet and evenly coat layer to the overall surfaces. The uneven coat (dry spray) will produce a rough and uneven surface since there are dust attached to the surface.
the dry spray
Here are the things that must be considered to avoid dust spray:
- The finishing material
Instead of the proper viscosity of the finishing material also requires a proper drying time to avoid dust spray. A material layer should be wet quite long time to make sure the layer have enough time to receive the material dust spray during a spraying process. The wet layer will let the dust spray stuck is dissolved and merged with the surface layer and does not generate rough surface. Ideally a finishing layer of the first stroke spray gun is still wet until the last stroke is done. The coating layer must be remain wet until the last stroke of the spray gun movement, so the dust spray from the spray gun movement will be able to be accepted and mixed by surface finishing layer without causing a rough surface.
For a wide and big surface for example such as: big cupboard, or wide and long table it is sometimes rather difficult to be fulfilled. We may need to adjust the finishing material to dry slower. Add retarder to the mixture to slower the material drying time when we spray to the big objects.But we cannot set the drying time too long. Too long drying time will slower the finishing process. Too long drying time will also risk to affect the gloss and get problem with dust.
- The setting and selection of spray gun.
- The spray techniques
- The finishing and drying room.
Post a Comment for "Dust spray problem in the wood finishing"