There are mostly two kinds of surface treatments for planting racks:

Powder coating treatment: many indoor planting racks adopt spray painting process, such as common iron planting racks. Powder coating can form a protective film on the surface of the planting rack, which not only prevents the metal from rusting and prolongs the service life, but also provides a rich choice of colors, such as white, green, black, etc., so that it can better match the indoor environment and enhance the aesthetics. For example, the multi-layer iron planting frame placed on the family balcony, after white powder coating treatment, looks simple and generous, and complements the surrounding greenery.

Galvanized: Some planting racks that require high corrosion resistance will be galvanized, including hot-dip galvanized and cold galvanized. After galvanization, the surface of the planting frame forms a layer of zinc, which can effectively resist the erosion of the humid environment. For example, in some indoor greenhouses with high humidity, galvanized treatment ensures that the planting frames will not rust and maintain structural stability under long-term humid environment.