Indian Sandstone paving like most types of natural stone paving has a degree of porosity which essentially means it’s permeable. Indian sandstone paving is an excellent material for all landscaping applications from patios to driveways, however its porosity means it does need to be sealed after installation. Always use a good quality impregnating sealant that is specifically formulated for natural stone. Without sealing Indian sandstone can start to look worse for wear after a few years and will require increased maintenance to keep it looking at its best.