From then to about a year, the zinc oxide absorbs environmental moisture and slowly converts to zinc hydroxide, which also requires profiling and a vinyl wash primer.Passivation can be accomplished using any commercially available vinyl wash primer. As a consequence, the oxide needs to be profiled and then passivated. For the next four to six months, the surface becomes zinc oxide, which is very difficult to paint because it’s a hard, lubricious surface and the zinc oxide on the surface tends to be powdery and therefore difficult to adhere to.During the first few days, the surface is zinc metal and merely requires proper surface preparation.It depends on how long the item has been galvanized.The chemistry of galvanized steel changes over time: Such methods might be needle scaling, soda blasting, dry ice blasting, glass beading.ĬAN I USE STEEL-IT TO COAT OVER GALVANIZED STEEL? What we want you to avoid are methodologies that merely clean the surface without scarifying it and providing an aggressive profile per our instructions.In other cases, some of our customers have found that mechanically sanding the surface using #36 grit paper provides a similar surface to grit blasting. For example, if you require the STEEL-IT High Solids Epoxy System, then grit blasting is absolutely necessary. WHAT IF I CAN'T GRIT BLAST? ARE THERE OTHER METHODS I CAN USE TO PROPERLY PREPARE THE SURFACE?
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