Web Seal® Tape is designed to hold coatings, whether water or solvent based, on virtually all roofs. This superior, faster method of waterproofing eliminates the dependence on the roof coating as a water barrier and makes the roof water-tight prior to application of the coating. WebSeal remains flexible even in temperatures as low as -70°F, making it impossible to thermally shock the seam and cause a leak. It bonds to a wide range of surfaces, including difficult roof materials such as EPDM, TPO, CSPE/Hypalon, most PVC, CPE, SBS, APP modifieds, asphalt BURs, coal tar BURs, plus all metal roofs, tiles, shingles, aluminum, Galvanized steel, gypsum board, wood, polyethylene, propylene, polystyrene, fiberglass, brick, concrete, masonry, OSB, etc.

Product Type: Seaming Adhesive, Tape

Application Area: Recreational Vehicles, Roofing Tiles, Roofs, Seam Sealing

Compatible Substrates & Surfaces: Aluminum, Asphalt, Brick, Concrete, Ethylene Propylene Diene Monomer (EPDM), Fiberglass, Galvanized Steel, Gypsum, Masonry, Metal, Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), Polyvinyl Chloride (PVC), Styrene Butadiene Styrene (SBS), Thermoplastic Polyolefin (TPO), Wood

Features: Highly Flexible

Technical Data Sheet
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Identification & Functionality

Product Type
Product Families
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WebSeal utilizes EternaBond's advanced MicroSealant Technology, a 100% solids formulation of synthetic resins, thermoplastics and non-curing rubber (non butyl) with a built in primer. It is bonded to a woven polyester backing for maximum contormability. The adhesive coating is protected by a silicone release liner, to be removed prior to application.

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Application Area
Compatible Substrates & Surfaces
Basic Use
  • WebSeal tape is used to seal roof joints (seams) and tears, flashings, copings, skylights, gutters, etc. Perfect for repairing and restoring roofs on mobile homes and RVs.
  • Extremely flexible, with no memory, so WebSeal conforms to virtually any shape without springing back.
  • WebSeal seals to itself so it can be cut and folded around an object. A top coat of roof coating is necessary for UV protection.
Application Instructions
  • Surface Preparation:

Surface must be clean and dry. Moisture, dust, dirt, or other foreign matter should be removed. Remove oil and grease, etc. with EternaClean or a non residue cleaner such as acetone or lacquer thinner. Remove salt and other contaminants.

  • Application:

Install WebSeal over the repair area, removing the release liner gradually to prevent contamination of the adhesive prior to application. Rub or roll with pressure using your hand or a steel roller to activate bonding process. This material may be applied to clean dry surfaces from 150°F to -20°F ambient. Treat surface with EternaPrime installations from 40°F to -20F ambient. A topcoat of roof coating is necessary for UV protection.


Technical Data
ValueUnitsTest Method / Conditions
Application Temperature150 - ( - 20)°F-
Elongationmin. 500%-
Flexibility Temperature Range- 70 - 200°F-
Low Temperature Flexibility (radius at -30°F)0.5inch-
Standard Case Quantity100.0ft²/case-
Total Thickness30.0mils-
Water Vapor Test0.005gram/100" sq./24hrs/100°FASTME 96B

Technical Details & Test Data

Standard Roll Size

2.4", 6", 8", 12", 24", 36" x 50

Storage & Handling

Shelf Life
5 Years