LLPT WST233 Butyl Tape, 1 Inch x 33 Feet, White Rubber Waterproof Seal

Some sealing jobs need a material that can be shaped around corners and joints, others call for a long strip that can reinforce a window, roof, or vehicle seam. LLPT WST233 Butyl Tape is a flexible, non-hardening rubber seal in a 1-inch-wide, 33-foot roll, ready to mold to the repair area.

Its white finish suits sealing work on windows, doors, roofs, boats, RVs, and other listed applications where a flexible waterproof seal is useful.

Key takeaways

The synthetic rubber tape forms to tight corners, curves, uneven areas, and jagged surfaces. Its non-drying, non-hardening formulation stays moldable during application, while the adhesive backing helps it bond as you press it into place. The tape is waterproof and paintable, making it useful for sealing and reinforcing areas where a finished, continuous surface matters.

The roll measures 1 inch wide by 33 feet long and is 3 millimeters thick. It is white and made of rubber. Customers often highlight its flexibility, ease of handling, and sealing performance. Feedback on adhesion and durability is mixed, so careful surface preparation and firm application are practical steps for getting the tape in place.

How it fits

Use the tape for waterproof reinforcement around windows and doors, windshield and glass sealing, RV repairs, pipe and joint sealing, mobile home repairs, and patching EPDM or galvanized metal roofing. It is also suitable for boating, vehicle headlight sealing, seam repairs, securing windows, and roof reinforcement. Recommended surfaces include glass, fiberglass, wood, coated or uncoated metal, plastic, and rubber, the compatible-material listing also includes cement and stone.

For example, when addressing a roof seam or window edge on an RV, the flexible strip can be pressed along the joint and shaped around curves or corners. Compared with applying a sealant as a bead, a roll offers a continuous strip that can be molded along the repair path. Its listed operating temperature range is -20 to 98 °C, supporting indoor and outdoor sealing applications across varied conditions.

Practical tips

Start with a clean surface, then unroll the tape onto the area to be sealed and press firmly all around it. Give extra attention to corners and uneven sections so the strip follows the joint. The suggested installation temperature is around 10 °C, at lower temperatures, the tape can feel stiffer and may take longer to mold. The tape is paintable, which can help the sealed area blend into a finished installation.

Practical questions

Which surfaces can the tape be used on? It is recommended for glass, fiberglass, wood, coated or uncoated metal, plastic, and rubber. Cement and stone also appear in the compatible-material listing.

Can I paint over the tape? Yes. The product is described as paintable, so it can be used where a painted finish over the installation is desired.

How should I apply it? Clean the surface first, place the tape along the target area, and press around the tape to form the seal. At lower temperatures, allow more time to mold it into place.

Buying verdict

Choose LLPT WST233 when a repair calls for a flexible, moldable waterproof strip rather than a sealant applied as a bead. Its 1-inch width, 33-foot roll, and ability to form around irregular joints make it a practical fit for roof patches, window edges, vehicle seams, and other sealing tasks on its recommended surfaces.