It's a good idea to be aware of the needs of a porous surface before any coatings can be applied.
Liquid or gas can pass through the tiny holes of a porous surface.. In order to prevent porous surfaces, such as brickwork, from being penetrated by water or damaged by frost, a silicone water-repellent layer can be applied. This will preserve the substrate. A silicon water-repellent layer will dry clear.
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