Essential Sandstone Sealer Colour Boost is a strong stone sealer designed specifically for natural sandstone surfaces. Additionally, it is excellent for other porous natural stone, such as limestone and slate. The powerful, environmentally friendly product provides high-quality stain protection whilst softly enhancing natural stone hues with richer, more brilliant colours. It's also worth noting that it can be used on either external or internal surfaces. Please keep in mind that this product is not suitable for Kandla Grey (mid and light grey) sandstone. Coverage will vary based on surface porosity, but will cover 4-6 square metres per litre. Available in 5L and 25L. HOW TO APPLY: 1. Remove any loose debris from the work surface before beginning your work, and make sure you have adequate personal protection, such as gloves , proper protective eyewear , a face mask , and appropriate clothing. 2. Before applying the product, make sure the surface is fully clean and dry, and that the weather conditions are suitable. 3. Apply the first layer of Essential Sandstone Sealer Colour Boost with a low-pressure sprayers , rollers , natural fibre brush, or sponge . DON'T DILUTE. After 20 to 30 minutes, thoroughly remove any excess sealant from the surface. 4. Repeat the treatment 45-60 minutes later with a second application. During the curing process, which can take up to 72 hours, keep the stone surface absolutely dry. Any moisture or water that remains on the surface may cause the sealer to dry unevenly, perhaps resulting in unsightly white areas. PLEASE NOTE: The color/appearance of the stone surface will be altered by Essential Sandstone Sealer Colour Boost. Prior to usage, always test the product in an inconspicuous location. Masking tape should be used to protect surfaces that will not be sealed .