Does the paint on galvanized sheets and stainless steel always come off? You may be missing an "epoxy zinc yellow" primer!

2026-01-03 13:31:37

 Hello to all engineers, project leaders, and friends who are worried about the anti-corrosion of workshop equipment and outdoor steel structures!

We have all encountered this headache: a brand new galvanized sheet, stainless steel or aluminum alloy, the surface is so shiny that it can be seen in a mirror, and you want to paint it to protect it or change the color, but what is the result?The paint that is applied either has poor adhesion, or it is easy to peel off in whole pieces. It is like wearing an ill-fitting raincoat that falls off as soon as it is pulled off.

Today, we will specifically talk about the expert who solves this problem of "difficult to paint a smooth surface" - Epoxy Zinc Yellow Primer.It is not a new thing, but in certain fields, it is an indispensable "key player".

1. Why is it so?The secret to “grasping” smooth surfacesOrdinary paint can "bite" firmly on rough surfaces, but on smooth and dense surfaces such as galvanized sheets and stainless steel, it is like pasting paper on glass, lacking a focus.The secret of epoxy zinc yellow primer lies in its "double bonding power".

First of all, the zinc yellow pigment it contains can produce subtle chemical bonds with metal surfaces (especially galvanized layers and oxide layers of aluminum alloys), like extending out countless "little tentacles" that are firmly adsorbed on the substrate.Secondly, epoxy resin itself has excellent adhesion and film-forming density.The combination of the two and the dual effects of physics and chemistry achieve the effect of being able to "take root" even on the "smooth and water-slippery" surface.

2. More than just “grabbing firmly”: several brushes for epoxy zinc yellow primerIt is not enough to stick with light. As a qualified starting point for protection, it must withstand subsequent tests.

"Hard bone" wear resistance: The paint film has high hardness after drying at room temperature. It is not easy to damage the primer due to bumps and scratches during transportation and installation, providing a solid "foundation" for subsequent coatings.

"Anti-salt water" corrosion resistance: It has excellent salt spray resistance, which is crucial for coastal areas, chemical plants or environments with corrosive atmospheres.It can effectively block the invasion of water vapor and salt on the underlying metal.

"Good Temper" has a wide range of packages: it is an excellent "middleman".After it is applied, it can be covered with a variety of intermediate coatings and topcoats such as epoxy mica iron intermediate paint, acrylic polyurethane topcoat, fluorocarbon topcoat, etc. as needed. The compatibility is very good and can build a complete "primer-middle coat-topcoat" heavy anti-corrosion system.

"Flexible body" resists deformation: The paint film has good mechanical properties, such as slight bending and impact of metal components. It can also follow the deformation without being brittle or falling off, ensuring the continuity of protection.

3. Where is it best suited to appear?(Application Area Guide)Simply put, when any metal with a smooth surface, non-ferrous or plated surface needs to be painted for anti-corrosion or decoration, you should first consider using it as a primer:

Galvanized steel: galvanized sheets, galvanized pipes, galvanized steel structures (such as factories, sun sheds).This is its "main battlefield".

Stainless steel products: Outdoor stainless steel facilities and equipment casings need to be changed in color or additional protection added.

Aluminum alloy surface: Aluminum alloy door and window frames, curtain walls, rail transit vehicles, etc.

Others: Metal surfaces treated by phosphating, chromating, etc.

4. A few practical construction remindersNo matter how good the material is, it can be used incorrectly