Product Data Sheet Show all documents
EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC

EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC

Heavily-filled, fibre-reinforced, trowellable bituminous compound

EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC is a trowel-applied, black, heavily-filled bituminous compound with added fibres for reinforcement. The product forms a surface skin, but the mass below remains soft to allow for moderate movement. Suitable for sealing and filling holes in mastic asphalt, roofing felt, corrugated iron, metal guttering and downpipes.

  • Fast drying
  • Fibre-reinforced
  • Suitable for use with all bituminous surface coatings
  • Remains flexible for long periods after application
Flexibility Provides a soft resilient coating Flashpoint50°C
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Product Data Sheet Show all documents

Usage

Mainly used for:
  • Waterproofing, stopping, bedding, bonding and sealing.
  • Adheres to/fills holes in: mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber.
 

Advantages

  • Fast drying
  • Fibre-reinforced
  • Suitable for use with all bituminous surface coatings
  • Remains flexible for long periods after application
Flexibility Provides a soft resilient coating Flashpoint50°C

Packaging

1ltr, 2.5ltr, 5ltr tins

Colour

Black

Product Details

Product Information

Chemical Base

Bitumen in white spirit, gas oil

Shelf Life

24 months from date of manufacture in undamaged containers.

Storage Conditions

Contains a flammable solvent; take normal precautions against fire during both storage and use. Store in original container in cool (5°C - 25°C) dry conditions.

Density

ca. 1.45 g/cm3
Technical Information

Chemical Resistance

Resistant to: most salt solutions, dilute acids and alkalis, water and alcohol.

Not resistant to: oils, solvents and some detergent solutions.

Thermal Resistance

Will not flow or sag within service temperature limits

Service Temperature

-10°C to +50°C

Application

Application Information

Ambient Air Temperature

5°C to 40°C. Surfaces must be free from ice and water.

Drying time

24 hours to develop a surface skin, the mass below remaining plastic for many months.
Consumption

Yield

2 litres per m² (giving 2mm wet thickness)
Application steps

SUBSTRATE PREPARATION

As with all surface coatings, preparation of the surface is of great importance and will influence the degree of adhesion obtained and the life of the coating.

All surfaces must be sound, stable and thoroughly clean and dry. Metal surfaces should be wire brushed to remove rust. Where long term protection is required an initial treatment of a rust-inhibitive product such as red lead or zinc phosphate should be used. Loose or blistered paint should be removed. New galvanised surfaces should be roughened with a wire brush or treated with a proprietary etch primer. If the surface is still dusty after preparation, or coated in weathered bitumen, prime with BLACK JACK® BITUMEN PRIMER and allow to dry. To assist in cold weather application, store the material in a warm room overnight prior to use.

APPLICATION

EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC is ready for use and should not be thinned.

Apply by steel trowel or putty knife.

CRACKS AND HOLES

Force the compound into the crack, but finish with a 25mm band at a 3mm thickness running the length of the crack. For large cracks and holes, apply the compound over the area to be treated and embed a closely woven glass fibre membrane into the compound to overlap the crack or hole by 50mm. Allow to dry and then apply a second coat, fully covering the reinforcing membrane.

CORRUGATED IRON/FIBRE CEMENT SHEETING

Tighten loose hook bolts and trowel around with mastic. Remove loose screws, re-bed screws and washers in EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC and tighten. Top seal in further mastic and trowel to a smooth finish. If the sheet is cracked, clean and prime with BLACK JACK® BITUMEN/FLASHING PRIMER and apply a bandage strip of glass fibre embedded in the mastic. When dry, overcoat with BLACK JACK® BITUMEN /FLASHING PRIMER followed by BLACK JACK® BITUMEN PAINT. Use the same technique for sealing side and end laps in corrugated sheeting.

 

TILES

Point up butt edges of ridge tiles, fillets and slates with EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC.

LEAD AND ZINC

Trowel over cracks and pinholes, where necessary, reinforcing with a woven glass membrane, fully embedded and covered.

FELT

Re-adhere loose felt using BLACK JACK® ROOF FELT ADHESIVE. Apply EVERBUILD® BLACK JACK® 903 BITUMEN TROWEL MASTIC and overcoat with BLACK JACK® ALL WEATHER ROOF COATING. Note: felt must be completely dry before applying the mastic.

CLEANING OF TOOLS

Tools may be cleaned by using white spirit. Spillages should be wiped off surfaces before the primer has set.

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