What Is Rockcote Lime Plaster? Rockcote Lime Plaster, similar to lime render, is a fine-grained, natural plaster made from hydraulic lime. Designed for both internal and external use, it can be tinted with alkali-resistant pigments to achieve a wide range of colours and finishes. From a classic float finish to artisanal decorative techniques, this plaster is perfect for creating unique and personalised designs. Unlike modern coatings, lime plaster develops a natural patina over time, adding depth and character to any surface. Additionally, it contains no Portland Cement and has zero VOCs, making it a healthier and more sustainable choice for your home.