When the steel structure is repaired, the surface generally has serious corrosion, and it cannot be thoroughly sandblasted or shot blasted like a new construction project. It is often only possible to perform simple polishing and cleaning. The rust cannot be completely removed, and the surface is affected during construction. The environmental impact is relatively large, leading to adhesion problems and the coating failure.
Zindn can provide suitable solutions for the pre-treatment of steel during repairs.

In general, the higher the surface treatment level, the higher the adhesion of the paint film to the substrate. However, in reality, the surface treatment is often unsatisfactory, failing to meet the requirements of sandblasting Sa2.5 and roughness. At the same time, environmental conditions will also affect adhesion, and high relative air humidity will cause the following problems:

①Condensation on the surface of the substrate increases; ②Condensation leads to flash rust, causing coating failure; ③The condensed water vapor generated on the surface of the substrate may cause blistering and delamination of the paint film;
For the possible coating failure problems of the above substrate conditions, Zinc Shield has introduced a low surface treatment primer coating system program. The low surface treatment primer of this program has low requirements for the treatment of the substrate, and the wetness of the substrate surface Insensitive to air, it can effectively solve the problems that plague customers.