The Mastic Tape 10m Roll is a double-sided, self-adhesive butyl sealing tape designed for bonding waterfall liners, pond liners, and membranes in pond and water feature construction. At 5mm thick and 50mm wide, this flexible butyl-based tape creates a watertight bond when applied between two clean, dry surfaces.
It is particularly useful for joining overlapping EPDM or Butyl pond liners, attaching waterfall spillways, or performing minor patch repairs. Mastic Tape is easy to handle and can be applied using a hand roller for strong adhesion and long-term reliability. It remains pliable to accommodate movement and slight settlement over time.
Note: This tape is not recommended for use under static water pressure, such as submerged permanent joins or deep pond bases.
Features & Benefits
Double-sided sticky butyl tape – strong tack and long-lasting bond
Perfect for liner joining – great for attaching waterfall liners to the main pond liner
Flexible & durable – handles movement, expansion, and minor shifts
Easy to apply – peel-and-stick with no heat or primer required
Clean application – minimal mess with simple trimming and finishing
Strong waterproof seal – ideal for above-water or damp-prone areas
Applications
Joining pond liners in ornamental ponds, wildlife ponds, koi ponds, or water features
Sealing waterfall spillways to the main pond liner
Repairing small tears or slits in liners (not submerged)
General butyl bonding in landscaping, roofing membranes, and flexible jointing
Application Guidance
Ensure both surfaces are clean, dry, and free from debris or dust.
Lay the liner flat and align the joining area.
Peel back the release film from one side of the mastic tape.
Place the tape between the two materials to be bonded.
Use a roller or firm pressure to ensure a complete bond.
For best results, apply in warm, dry conditions and avoid submersion.
Sizes Available
Tape Width: 50mm
Tape Thickness: 5mm
Roll Length: 10 metres Please Note:
This product is dispatched directly from our trusted supplier’s warehouse. While we aim to keep product availability as accurate as possible, we do not have live stock control for these items. Availability is subject to change, and delivery can take up to 15 working days, depending on stock levels at the time of order.
Tracking information will be provided where available, but please note this is dependent on the supplier’s shipping process. If you have any questions about lead times or delivery, our team is happy to help before you place your order.

Property Detail
Product Type Double-sided butyl mastic sealing tape
Tape Width 50mm
Tape Thickness 5mm
Roll Length 10 metres
Adhesive Type Butyl rubber adhesive (double-sided)
Application Conditions Clean, dry surfaces; above waterline use
Surface Compatibility EPDM liners, Butyl liners, membranes
Submersion Suitability Not recommended for submerged/static water
Installation Tools Hand roller or firm hand pressure