Seeps into cracks and holes to form a waterproof, weatherproof seal. Non hazardous, non flammable, safe around plants and animals when liquid is in a fully cured and dried state. Forms a durable, breathable, weatherproof non slip barrier. Resistant to rain, snow, sun, wind, hail, air, moisture, UV degradation, extreme temperatures and natural weathering. Blocks out air, water, and moisture. Prevents rust and corrosion. Mildew and chemical resistant.