Professionals can identify a good product just by using it. Their expert eyes can see immediately whether the surface appearance is developing uniformly and whether the coating will withstand mechanical stress.
Metal is a versatile, highly stressable material. This is why it is used in many different forms in construction. But although metal components have outstanding static properties: only lasting protection from corrosion guarantees maximum value preservation and optimal durability. Ferrous metal (F-metal) and non-ferrous metal (NF metal, e.g. zinc) require different coating build-ups. First of all, it is important to check what metal the surface is made of:
F-metals must have corrosion protection. Otherwise they would quickly oxidize and eventually lose stability. Reliable, lasting and high-quality corrosion protection therefore starts with careful pretreatment of the substrate. DIN EN ISO 12944 defines the criteria for creating a coating that is as impermeable as possible. It stipulates that the required minimum thickness depends on two factors: the corrosiveness category, i.e. the protection duration to be achieved, and the bonding agent of the prime coat. Multi-Primer 227 and MP Thick Film 229 have proven effective as a corrosion protection system for iron and steel components.
It is important to inspect the coatings carefully before application. Due to the relatively low solid content in water-based paints, substrate roughness is tendentially less well leveled than with solvent-based alkyd resin enamel paints. The choice of the abrasive also has a significant impact on the quality of the surface. To prevent normal sandpaper from clogging: Treat acrylate surfaces with a paper that contains dust-repelling materials in the size coat. With a nonwoven abrasivel, on the other hand, the gaps are sufficiently large and therefore do not clog as easily. Our professional tips for checking the substrate:
Be cautious when using a factory-made prime coat or a coil coating. Conventional substrate testing methods such as scratch tests and cross-hatch adhesion tests may initially provide good adhesion data. Flaking may nevertheless occur after coating. The new coating should therefore always be matched to the existing old coating. 2C Epoxy Primer 855 is particularly suitable as a prime coat for coil coatings, powder coatings, and two-component coatings. In individual cases, the suitability must be checked on-site with a test coat.
Window and door frames, but also facade and balcony paneling, are often made of hard PVC. This can be coated for design reasons: to improve the appearance of components that have been weathered, for example. Or to create a different color design. However, the coating system must be specifically suitable for use on plastics. Silicones or waxes used as mold separating agents during plastics manufacturing also make adding a subsequent coating even more difficult. Our recommendation for a particularly durable prime coat: 2C Epoxy Primer 855.
Our professional tips for checking the substrate:
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