Sand Blasting Before we can powder coat, the surface needs to be cleaned. Sand blasting is used to clean surfaces and prepare them for a new finish. It is also an effective method for removing rust, oxidation and old paint. Old gates, railings, metal parts or any other metal piece can be stripped clean using this method.
Sand blasting is carried out in a special booth and the worker is required to wear safety gear. An abrasive mineral (garnet) is forced through the nozzle of a specialized blasting machine at high pressure to blast away paint and rust. The abrasive material is propelled by compressed air.
Powder coating is an advanced method of applying a decorative, protective finish to a wide range of materials and products. The powder used for the process is a mixture of finely ground particles of pigment and resin, which is sprayed onto a surface to be coated.
The dry pigmented powder, if held in your hand, looks and feels like colored BABY POWDER. It is also just as safe. Basically because it is free of the hazardous volatile organic compounds (VOC) contained in liquid paints. The powder is applied electrostatically. “Charging” the powder with voltage and spraying the item, which is hung with metal hooks.
Today, powder coatings are available that result in a highly durable finish in a variety of colors, glosses and textures. New formulations in powders have made it possible to achieve innovative finishes that are above and beyond liquid paints.
Next, the item enters an oven and is cured at approximate temperatures from 300° to 400°F. Any materials that cannot withstand this time and temperature exposure must be removed before coating. This would include foam insulation, rubber, plastic, bushings, paper or gaskets.