Whether you are starting with a new part or restoring a piece, sandblasting can be crucial step in the process. For the powder coat to stick and have proper adhesion, the substrate must be clean and have the appropriate profile for the best finished product. Old paint, powder, rust, grease, mil scale must all be cleaned/removed from the substrate. Blasting can be accomplished with many kinds of media that range from crushed glass, to plastic media, to steel slag, coal slag, aluminum oxide, or even baking soda. We use a product called Starblast which is a blend of course and fine staurolite sands. This media provides the ideal surface profile on metal substrates for proper powder coat adhesion.
What is Powder Coating
Powder coating is a baked on finish that is in the paint family. Powder coating is far superior in many respects to traditional wet spray paint finishes. Powder is applied electrostaticly (parts are grounded and the powder is positively charged through the delivery system) and then baked at the specified temperature and time duration to achieve flow and full cure. Finishes for powder coating can range from a satin textured finish to a high gloss metallic mirror like finish. The standard TGIC Poly powders will cure at 400*F for about 10-12 minutes at part temperature. Once parts have reached full oven cure they are removed and ready to handle/use once they have cooled to the touch unlike traditional wet paints that require extended cure times. When looking into powder coating parts, as with other finishes, it is important to know what kind of environment the finished product will be used in. The main reason for this is so that the proper product is used. Powder coating comes in many different “mixes” that have different qualities and specifications, for example, epoxy powders do not contain UV protectants and therefore would not be suited for exterior uses that are exposed to the sun.