Mastech Panel Seal is a high performance butyl tape for uses in steel and aluminum roofing and panels. It is used to provide a long-life, airtight seal on panel connections. It will never crack or peel by the thermal movings or vibrations of the metal systems. Mastech Panel Seal is compatible with galvanized or painted metals, steel, aluminium, PVC, glass, plexiglas, polycarbonate, wood, concrete, fiber cement and many other construction materials.

Mastech Panel Seal

Areas of Use

  • Metal roofing
  • Metal constructions
  • Aluminium facade panels
  • Roofing and panels joinery
  • Sealing rooflights
  • Sealing end side laps in roofing systems
  • Metal roofing penetrations
  • Siding insulation
  • Sealing metal flashings

It’s also excellent for sealing;

  • Prefabricated houses
  • Containers
  • Wooden sheds
  • Stalls
  • Around windows, doors, roof vents, stacks, accers doors and other penetration points.

Features and Benefits

  • Excellent adhesion to steel, aluminum and wide range of substrates
  • No primer is required
  • Permanently adhesive and flexible
  • 100% solid to keep its volume, non-cracking, non-crumbling
  • Non-hardening, non-drying, non-oxidizing
  • Long service life
  • Excellent chemical and UV resistance
  • Not contain any solvents, bitumen, tar, asbestos, etc.
  • Silicone backed release paper for easy installation
  • Non-Toxic
  • Needs no special handling
  • Available in a variety of size and widths



1/4″ x 3/16″

• 6,0mm x 5,0mm x 12,2mt

1/2″ x 1/8″

• 12mm x 3,0mm x 13,7mt

1/2″ x 3/32″

• 12mm x 2,0mm x 13,7mt

3/8″ x 3/32″

• 9,5mm x 2,4mm x 18mt

7/8″ x 7/32″

• 22mm x 5mm x 12.2mt (U Shape)

7/8″ x 3/16″

• 22mm x 4mm x 12,2mt (U Shape)

Other sizes available upon request

Typical Physical Properties


Black / Grey



Specific Gravity




Vapor Transmission rate

0.15 g/m2/24sa/mm)

Service Temperature

-40 °C / +88 °C (-40 °F / +190 °F)

Solid Content


Cold Temperature Flexibility

No Cracking or Loss of Adhesion