Amazon has 2-Pack Gorilla Waterproof Patch & Seal Tape (4" x 10′ Black) for $17. Shipping is free w/ Prime or on $35+.
Product Description from Amazon
- Gorilla Waterproof Patch & Seal flexible tape creates a permanent bond that instantly seals out air, water and moisture
- Gorilla Waterproof Patch & Seal flexible tape works on indoor or outdoor repairs and even under water
- Gorilla Waterproof Patch & Seal flexible tape has an extra thick adhesive layer and UV resistant backing
- Gorilla Waterproof Patch & Seal flexible tape and conforms to the surface to repair holes, cracks, gaps, and tears
- Gorilla Waterproof Patch & Seal flexible tape repairs leaks in roofs, low pressure pipes and hoses, rubber, plastic or vinyl pool liners and much more