Why is the galvanized coating on my trailer rough and mat?
Since your trailer’s parts have been immersed in molten zinc, it’s difficult to obtain a uniform coating, especially when the part is asymmetrical or of a complex shape. The roughness on certain parts of the trailer’s structure is due to an uneven accumulation of zinc.
As for the mat appearance of your hot dipped galvanized trailer, this is due to the passivation cycle of zinc which takes about 18 months. It can also be due to the fact that some types of steel have a more mat finish than others. Rest assured that this change of color in no way affects the anticorrosive properties of the finish.
If your new galvanized steel trailer develops yellowish stains, this is a sign the cycle of passivation has begun. The stains will disappear after a short time.