Perma-Chink is a flexible, textured chinking that seals the open gaps between logs to eliminate heat loss and air infiltration. Even though it looks and feels like traditional mortar, it's not. Perma-Chink is a pure acrylic that adheres to logs and stretches to maintain a tight seal by following log movement. Like all of our products, Perma-Chink is easy to apply and comes backed by the support of our knowledgeable, friendly staff. When you use Perma-Chink, professional advice is never more than a phone call away. Application can be done by the homeowner or a professional contractor.