William Hercock’s Building Chemicals are engineered for builders who demand precision, performance, and professional results. From high-performance admixtures and sealants to hard-hitting cleaners, levelling compounds, adhesives, and grout, this range delivers the chemical muscle your project needs. Perfect for sealing out moisture, smoothing rough substrates, securing tiles, and cleaning stubborn cement—that's exactly what they are built to do. Trusted, trade-grade formulas cut through construction challenges, performing reliably whether it's prepping floors, sealing facades, or bonding surfaces.
Water Seal Plus is a high-performance water repellent for all porous building materials. The product can be applied to already damp surfaces, which will then, over time, dry out as the coating allows water to escape out and not penetrate in. In addition, water Seal Plus uses technology proven to increase Thermal Efficiency, reducing heating costs.
In addition to acting as a water-proofer, it provides a hard-wearing, invisible, protective seal against oil, stains, efflorescence, etc., on both horizontal and vertical surfaces with no long-term alteration of the colour of the substrate.
Water Seal Plus is recommended to treat walls, fountains, monuments, garden stones and paving, headstones, timber structures, fences and decks.