X300 Surface Sealer™ – Invisible Protection for Concrete & Masonry Oxtek X300 Surface Sealer™ is a high-performance, zero-VOC penetrating sealer designed to protect concrete and masonry without altering the surface appearance. Used alongside X220 Moisture Fix™ or X200 Densi-Proof™, it provides long-lasting defence against staining, moisture, efflorescence and environmental wear. Ideal for projects where a natural, unchanged finish is essential. Features: Easy single-coat application Preserves the natural look of concrete and masonry Invisible finish – won’t darken, yellow or change surface tone Reduces staining for cleaner, longer-lasting surfaces Zero VOC, environmentally friendly and user safe Unlimited shelf life Eliminates efflorescence Resistant to freeze–thaw damage Improves resistance to fungus and mildew UV resistant for long-term durability Highly resistant to alkali attack Download the Oxtek X300 Surface Sealer brochure here.