Advanced 100-percent silicone rubber. Three-hour rain-ready and sun/freeze proof caulk for aluminum and metal projects. Typical uses: sidewalks, driveways, patios, masonry, steps, foundations (above ground) and tuck/repointing masonry. Adheres to: most concrete, granite, brick, slate, ceramic tile, asphalt and wood. Easy gunning. Flexible. Fifty year durability. Fills cracks and small holes with a durable weathertight seal. No mixing. No mess.