57 Coating Thicker coatings (also self-leveling coatings), polymers (also with the addition of cement or fine aggregates), which are applied as a layer or in several layers on the surface. In most cases, a coating is not applied without a primer in order to ensure adhesion to the substrate. Coatings can be based on epoxy resins, polyurethane resins or poly methyl methacrylate resins (PMMA), for example. As long as there is a closed film on the surface, nothing penetrates the subsurface. Coatings are usually crack-bridging and aremostly used in car parks and underground garages. Coatings are declining in industrial halls because they are too expensive and too expensive to maintenance. High costs can arise here, especially in the subsequent renovation. Regardless of the fact of disposal and sustainability. Coatings can also be scratched bymechanical stress and, aswith the previouslymentioned impregnators / sealers, infiltration and peeling of the coating can occur. Even with moisture from the subsurface, there is a risk of blistering and blowups. Specialist company is usually necessary for repairs to this surface protection system. Plasticizer migration or black marks, lines, e.g. due to the friction of plastic or rubber tires on fork lift trucks, can also occur with coatings. The removal of such marks is usually only possible through mechanical use of e.g. abrasive cleaning pads or diamond cleaning pads, if thesemarks are in the superficial area. However, if strong chemical resistance is required for industrial areas, a coating is essential. This also applies if slip resistance classes above R11 have to be achieved. Coating is thick on top - can scratch or peel off.
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