The Supraten Supraton Extra is a universal primer designed for both interior and exterior mineral surfaces. By strengthening the substrate and reducing its absorption capacity, it ensures that subsequent layers of paint or plaster adhere more effectively while providing an extra layer of protection for the base material. You can apply this 5 kg primer using a brush or roller, with a single layer covering between 7 and 10 square meters. It takes about 4 hours to dry completely, making it a practical choice for those preparing walls or facades for a fresh finish.