First of all, the anti-fingerprint effect does not mean that the fingerprint cannot be printed on the surface of stainless steel, but means that the traces printed on the fingerprint are lighter than ordinary stainless steel surfaces, and it is relatively easy to wipe clean and there will be no residual stains after wiping.
Anti-fingerprinting is achieved by coating the surface with a layer of a hydrophobic material that makes it difficult to adhere to stains such as lotus leaf. The adherent will not be able to stand on its surface and spread to achieve an anti-fingerprint effect.
Adhesion can not stand on the surface, spread is an important factor in achieving anti-fingerprint. To make the adherent difficult to stand on and spread on the surface, it involves the problem of reducing the surface tension of the contact surface. Surface tension is a manifestation of molecular forces. Due to surface tension, the liquid surface tends to shrink as much as possible (the pressure around the liquid is uniform and tends to the same point), so small droplets in the air tend to be spherical.
In short, the role of surface tension is to make the surface of the liquid shrink, it is related to the nature of the liquid, and has nothing to do with the size of the liquid surface. The surface tension can also be considered as the surface free energy, which can be regarded as the active state of the surface. The greater the surface tension, the more active the surface and the easier it is to adhere to other objects.
Generally, the surface of organics and polymers is a low-energy surface and it is difficult to be adhered. Inorganic salts such as oxides are high-energy surfaces and are easily adhered. To achieve anti-fingerprint is to reduce the surface tension of the surface by plating a film, so that fingerprints is difficult to adhere to the surface.
The surface of the stainless steel before painting should be treated, such as degreasing, using a weakly alkaline cleaning agent or solvent to remove oil, moisture, and other stains on the surface of the substrate, and it is preferable to phosphatize to enhance the adhesion.
After the paint is cured at an appropriate temperature (The fingerprint-resistant paints of different manufacturers may differ)
Another method is the sanding process, which essentially reduces the fingerprint contact area.