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Everbuild General Purpose Building Mastic Sealant 285ml 115 GG Waterproof Mastic Pack of 3

Code: 365874Mx3
  • £10.85
  • (FREE UK Delivery)
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These General Purpose Mastic Sealants from Everbuild form a flexible weatherproof permanent seal between many materials.


They are available in 285 ml C3 Cartridges in a variety of colours and pack sizes.  If you wish to purchase a mixed pack of colours just send us a message at checkout and we would be more than happy to oblige at no extra cost.


Everbuild General Purpose Mastic can be used for Perimeter pointing internally and externally around window frames, wood panels and doors. Can also be used for sealing composite sectional panels and low movement vertical building joints. It remains permanently flexible and forms a watertight rubber seal upon drying.  It is used externally, as it is waterproof and quick drying.


1 Tube will cover approx. 11 linear metres for a 6 mm diameter bead.


Description and uses


A mid modulus sealant that adheres to most smooth and non-porous materials.  Forms a powerful permanent seal.


Ideal for use in the following applications:

Perimeter Pointing internally and externally around Doors and Windows

Adheres to Concrete, Brick, Wood, Metals and Glass without the use of a Primer

Aluminium and plastic gutter sealing

Glass to glass and glass to aluminium & metal sealing




Apply using a standard sealant gun.  Surfaces must be sound, clean and dry, free from dust, grease and other contaminants.


The joint depth must never be greater than the width.


Minimum depth: 10mm. Maximum depth: 20mm for deep joints, reduce depth by using EVERFLEX FIX AND FILL FOAM or a suitable joint backer rod. All joints should be designed so that the seal is placed in a position which does not retain water or form a water trap. Triangular fillets should be no less than 12mm across the face and should be finished with a flat or convex face. Cut the tip of the cartridge taking care not to damage the thread. Apply nozzle and cut at an angle of 45o with an opening slightly larger than the gap to be sealed. Apply using a standard sealant gun. Best results will be obtained by keeping an even pressure on the trigger and keeping the gun at a constant angle to the surface being sealed. To ensure a proper bond, always smooth the sealant down with a spatula or piece of wood wetted with linseed oil or white spirits. An improved joint appearance can be achieved by placing masking tape to both sides of the joint, removing within 5 minutes of application.

Tool down within 15 minutes of application - we recommend the use of the seal rite smooth out tool or alternatively use a wetted spatula, piece of smooth dowel or a wetted finger.



Health and Safety


Direct contact should be avoided and gloves should be worn.  It is advised that this product is kept out of reach of children.




DO NOT use on Fresh Concrete or Mortar

DO NOT use on areas likely to be exposed to Solvents, Petrol or Oils

DO NOT use with bitumen or ashalt

DO NOT Upvc, polycarbonate or acrylic sheet.

May stain marble, slate or certain sensitive natural stones

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