Which sealer type is best used for highly porous surfaces?

Heavily pigmented sealers are particularly effective for highly porous surfaces because they contain a greater concentration of pigment and additives designed to fill and bridge the voids present in these types of surfaces. When applied, the pigments and the thicker consistency of these sealers work to penetrate into the porous material, effectively sealing the surface and providing a protective barrier against moisture and stains. This makes them an ideal choice for surfaces like concrete and masonry, where the porosity can lead to absorption issues if not properly sealed.

In contrast, oil-based sealers, while durable and effective for certain applications, may not have the optimal filling capabilities for highly porous materials. Water-based sealers, although easier to clean up and generally recommended for various applications, might not perform as well in terms of penetration and sealing effectiveness on very porous substrates. Transparent sealers typically provide a clear finish and are designed to enhance appearance rather than fill pores, making them less suitable for sealing porous surfaces effectively.