Water Repellents for Coatings and Inks: Overview

A water repellent causes water to bead and run off while typically staying vapor-permeable, letting trapped moisture escape. A waterproofing coating fully blocks water penetration, and often vapor too, which can trap moisture inside if not designed carefully.

They lower a substrate's surface energy, making it harder for water to wet and spread. Instead of soaking in, water beads and rolls off, reducing absorption and problems like staining, freeze-thaw damage, or mold growth.

Silicones and siloxanes are widely used for masonry/facade protection due to durability and vapor permeability. Waxes offer cost-effective short-term repellency; fluorochemicals were historically used for high performance but are declining due to environmental concerns.

Consider substrate porosity, whether breathability is required, exposure conditions, and desired service life. Masonry, wood, and textile substrates often call for different repellent chemistries.

Not necessarily. Strong initial beading shows the treatment works, but long-term protection also depends on resistance to weathering, UV, and abrasion. Some products with great initial beading lose effectiveness faster than more durable options.