Please justify, why silicate paints, despite the many positive qualities, less than others, they are suitable for making topcoats in places of repair and reinforcement of concrete elements

Concrete covered with silicate paint cannot be realkalised. It is true that the intact silicate paint coating is alkaline, however, it quickly disappears as a result of hardening by binding carbon dioxide. The potassium carbonate formed in the hardening process is easily rinsed out by rain. In this way, silicate paint is neutralized in a short time. Besides, it penetrates into the ground, being able to prevent concrete from regaining its alkaline reaction.
The silicate paint also allows a strong penetration of carbon dioxide and moisture, which causes further carbonation of the concrete, which cannot be stopped by painting with such paint.