Acrylic sealants
Acrylic sealants are water based, so they maintain their performance unchanged on both indoor and outdoor applications.
Suitable for porous materials, as described above, they can be painted and then, once the sealant has been applied and dried, it will be possible to make it uniform in color and brightness to the surface concerned.
There are several acrylic sealants on the market and to choose them it is necessary to analyze the surface to be sealed and to classify the joint.