Jack 903 Bitumen Trowel Mastic 2.5 Litre
JACK BITUMEN TROWEL MASTIC is a trowel applied black heavily filled
bituminous compound with added fibres for re-enforcement, used
primarily for patching holes in roofs and bituminous coatings. The
product forms a surface skin, but the mass below remains soft to allow
for moderate movement.
for use with all bituminous surface coatings
flexible for long periods after application.
stopping, bedding, bonding and sealing.
to/fills holes in: mastic asphalt, roofing felt, corrugated iron,
cast iron, fibre cement, slates, lead, copper, zinc, concrete and
not use in areas where subsequent solvent contact is likely.
inhalation of vapours in confined spaces.
not apply to damp surfaces.
sufficient drying time before overcoating.
overpaint with black bituminous products - the mastic may bleed
through other coatings.
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.
assist in cold weather application, store the material in a warm room
overnight prior to use.
JACK BITUMEN MASTIC is ready for use and should not be thinned. Apply
by steel trowel or putty knife.
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.
IRON/FIBRE CEMENT SHEETING
loose hook bolts and trowel around with mastic. Remove loose screws,
re-bed screws and washers in BLACK JACK BITUMEN 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.
up butt edges of ridge tiles, fillets and slates with BLACK JACK
over cracks and pinholes, where necessary, reinforcing with a woven
glass membrane, fully embedded and covered.
loose felt using BLACK JACK ROOF FELT ADHESIVE. Apply BLACK JACK
BITUMEN MASTIC and overcoat with BLACK JACK ALL WEATHER ROOF COATING.
Note: felt must be completely dry before applying the mastic.
may be cleaned by using white spirit. Spillage’s should be wiped off
surfaces before the primer has set.
spirits, gas oil
Gravity @ 20°C
litres per m² (giving 2mm wet thickness)
hours to develop a surface skin, the mass below remaining
elastic for many months
to 40°C. Surfaces must be free from ice and water
not flow or sag within service temperature limits
a soft resilient coating
And Water Resistance
to: most salt solutions, dilute acids and alkalis, water and
resistant to: oils, solvents and some detergent solutions.