2415 Flame Retardant  Mastic Blue & White

Mastic 2415 has been designed for application to roofs, walls and thermal insulation systems to protect and improve appearance as well as provide a flame retardant waterproof seal. The coating, which may be applied by brush or airless spray dries to become a plastic membrane. This will withstand extreme climatic conditions and severe atmospheric pollutions.

Technical Data

ColourBlue and White
BaseInternally plasticized emulsion
Solids Content60  ±  1%
ViscosityThick Paste
Mass per litre1.35kg
Solvent Clean-upWater whilst wet
Coat Rate1 – 2m²/Ltr per coat
Recommended dry film thickness0.8  –  1.2 mm
Drying time2 – 3 hours at 25°C  (hard dry  –  4 hours min.)

Mastic 2415 may be applied by brush or by airless spray (25 : 1 ratio pump with follower plate).

Dusty or powdery surfaces should be brushed or wiped with a damp cloth. Any oil or grease on the surface should be removed with a cloth soaked in solvent. If very friable or porous surfaces are to be coated, it is recommended that a primer is applied. Two coats of Mastic 2415 are normally sufficient to give adequate protection. A drying time of 2 hours is required between coats.


Each dry coating should be 0.6 mm thick, equivalent to coverage of approx. 2m² per Ltr per coating. Coating has good resistance to mechanical damage, this property may be enhanced by the incorporation of a reinforcing membrane such as scrim or bandage/cloth between coatings of Mastic 2415.


The water resistance of 2415 is not achieved until the coating is dry. It is recommended, therefore, that the material is only applied outdoors during periods of settled dry weather.

Mastic 2415 is suitable for application to concrete, brickwork, slate and felt roofs, plywood and chipboard. In particular it provides a means of encapsulating asbestos insulation in order to obviate the hazard of loose dust and fibre.


Foamed insulates such as polystyrene or polyurethane may be coated with Mastic 2415 in order to protect against weathering, ultra-violet light and the risk of fire spreading from an external source.

  • Application Temp. Limits 10°C to 40°C
  • Storage Temp. Limit 0°C to 40°C
  • Service Temp. Limit 10°C to 120°C
  • Flammability (ISO R340) complies
  • Water Vapour Permeance (ASTM E96) = 0,18 g/24h/m2/mm Hg
  • Combustibility Non-combustible
  • Shelf Life 6 months minimum in unopened containers. Stir well before use.
  • Protect from freezing during storage and use.
  • Not to be used for continuous immersion.
  • Not resistant to hot oil.
10% – No effectAlcohol – Moderate attackNH4OH – No effectSalt Spray – No effect
10%  HCOOH – No effectAromatic Oil – Slight attackNaOH – Slight attackOzone
10%  HNO – No effectWhite Spirits – Moderate attack
10%  H2SO4 – Slight attack


BE2 Bitumen

BE2 may be used as a waterproofing system as well as a vapour barrier compound for use in thermal insulation applications. BE2 emulsion is an aqueous dispersion of specially selected pure asphalts combined with fillers and additives to render it water and chemical resistant. The product dries to a semi-plastic film, which gradually loses its surface tackiness as it hardens. It is non-flammable when wet and so eliminates fire risk at the time of application.


Technical Data

Being of a thixotropic (buttery) consistency, it may be easily applied equally to horizontal or vertical surfaces even as a thick coating. The product has excellent adhesion to concrete, brick, asbestos cement, wood and weathered galvanised.


  • BE2 as a Waterproofing System: Surfaces to be coated should be clean, sound and dry. Where the surface is porous, it is necessary to prime first to ensure a good key for bonding. Apply undiluted at a coating rate of 5-7 m²/Ltr using a brush or roller. Apply an undiluted coat of BE2 at a rate of 2-2.5m²/Ltr and allow to dry. As soon as the surface is touch dry, apply a further coat of undiluted BE2 at a coat rate of 1,5 m²/Ltr, whilst simultaneously laying down a suitable supporting membrane. Apply subsequent coats of BE2 to thoroughly soak the supporting membrane, ensuring that the ultimate coating rate for the entire system is a minimum of 2,0 Ltr/m². Care should be taken to ensure that the waterproofing is applied to areas well above the water line, and at least 20cm up parapet walls and other structures that extend through the roof. Finally, to obtain the necessary exposure resistance, apply a coat of Acrylic Mastic at a coating rate of 2 m²/Ltr.
  • BE2 AS A Vapour Barrier System: Due to its excellent compatibility with insulating materials (it does not attack polystyrene foam) and its relatively low cost, BE2 may be used in thermal insulating work for medium-low temperature installations. Apply sufficient thin coats of BE2 to the insulating substrate to ensure a minimum dry film thickness of 1mm. Supporting fabric is generally necessary. For this purpose we recommend woven fibreglass (surface treated) or spun bonded polyester fabric. Allow the film to dry thoroughly before applying cladding, or top coating. Where cladding is to be applied, the surface should be allowed to dry for at least one week in warm conditions. This product, being highly filled, possesses poor vapour barrier properties, but provides an excellent key for bonding.
Number of Components:1
Base:Bitumen Emulsion
Viscosity:Thick, buttery
Non-Volatile Content:50 ± 1% w/w
Mass Per Litre:1,0 kg
Thinners / Clean up:Water while wet
Drying Time:3 – 4 hours. Hard dry : 14 days
Water Vapour Permeability:0,95 Perms at 1,2mm d.f.t.
Fire Resistance:Non-flammable wet. Does not sustain flame dry
Toxicity:Non toxic, suitable for drinking water installations
Application Temperature Limits:5ºC to 35ºC
Service Temperature Limits:-30 to 60ºC
Storage Temperature:5ºC to 35ºC
Shipping Classifications:Non flammable
Protect from freezing
Packaging:5 Ltr, 25 Ltr, 200 Ltr containers
  • Do not freeze
  • Do not apply in inclement weather
  • Allow to dry for at least 72 hours before immersion


The information contained in this technical data sheet is to the best of our knowledge correct. NO GUARANTEE IS EXPRESSED OR IMPLIED. Users must satisfy themselves as to the efficacy of the product in their application.


Q147 Mastic Black

Q147 is an acrylic copolymer/pigment blend designed for applications where exceptional durability, flexibility and UV resistance is required. It is particularly suited for use as a protective coating on roof coverings of all kinds and is ideal for rejuvenating faded roof tiles. Q147 is also recommended as a top quality wall and floor coating, where durability and wash-ability is required.

Technical Data

Apply Q147 at a spread rate of 4 – 5 m²/Ltr per coat. Tiled surfaces require a coating rate of 1 – 2 m²/Ltr due to their roughness and increased porosity. It is recommended that at least 2 coats are applied. Allow at least 2 hours drying between coats.

BaseAcrylic copolymer blend
Solids46% w/w (approximately)
Viscosity500-600 cP Brookfield
Mass per litre1.15
Spread rate4-5 m² per Ltr
ScrubbabilityOver 12,000 scrubs (SABS = 10,000)
CleanupWater when wet or methylated spirits when dry
  • Non flammable and non toxic.
  • May be applied by brush, roller or spray.
  • Easy cleanup.

Q147 has been specifically designed as a multipurpose coating and is suitable for application to the following substrates:

  • Cement.
  • Concrete.
  • Brickwork.
  • Bitumen roofing felt.
  • Galvanized sheeting.

Do not apply if rain is imminent as approximately 3 hours drying is required for adequate coalescence. Best applied in the morning as heat build-up of the substrate in the middle of the day will effect adhesion. Protect from freezing.

Application Temp Limits:+10°C to +40°C
Service Temp Limits:-10°C to +80°C
Storage Temp Limits:+10°C to +40°C
Shelf Life:6 months in unopened containers
Packaging:20 Ltr, 5 Ltr, 1 Ltr
Shipping Classifications:Non combustible, non hazardous


Mastic 835 grey

Mastic 835 “Acryl-Seal” is a seamless waterproofing system of outstanding quality and versatility. It is non-bituminous and liquid applied, curing to a tough elastomeric compound, which has excellent durability, weathering characteristics and chemical resistance. The system consists of five coats of “Acryl-Seal” applied in combination with reinforcing membrane.

Technical Data

Acryl-Seal system (Std roof surfaces)
Substrates details:
Pekay “Acryl-Seal” can be laid over a variety of surfaces, for example:

  • New concrete roof slabs or screeds
  • Vertical concrete or brickwork
  • Plastered surfaces
  • Metals such as galvanized iron
  • Insulation board
  • Existing waterproofing systems


Surfaces should ideally be sound, clean and dry. All surface contamination should be removed before application can commence.


The recommended fall on any flat roof system is a maximum of 1:80. Falls less than this lead to ponding, which can affect the long-term durability of the system. Expansion joints should be carefully inspected – while the system permits a limited of movement it is best to consult with the structural engineers as to the expected joint movements. (Further details on expansion joint design is given elsewhere in this technical data sheet).


Applicators must satisfy themselves as to the soundness of the substrate to be overlaid – a large proportion of failures and delaminations can be attributed to an unsound or inadequately prepared surface.

  • Do not apply in inclement weather
  • Surfaces to be coated must be dry
  • Not suitable for flat roofs with falls less than 1:100
  • Not suitable for permanent immersion in water
  • New concrete surfaces should be allowed to cure for two to three weeks before over coating
  • Suitable for light oedestrian traffic only (walkways are advisable for heavy pedestrian traffic)
  • Do not dilute


No guarantee is expressed or implied - Should a ten-year guarantee be required, an approved applicator will be appointed, and a gurantee will be issued by the company in writing.

  • Withstands all ambient temperatures
  • Resists mould and fungus growth
  • Has a high degree of resistance to abrasion and traffic
  • Being a brushable or sprayable liquid, it can be applied to areas which are normally not easily accessible
  • Will not loose its flexibility
  • Is resistant to degradation by ultra violet rays
  • Not affected to exposure of frost
  • Suitable for application to vertical surfaces without slumping
  • Non-toxic
  • Water-based polymer facilitates easy cleanup has been S.A.B.S. tested for 1000 hours in a weaterometer without deterioration

New concrete roofs

  • Wash off dust and building debris and leave to dry
  • Scrape down rough spots
  • Apply cementitious filler to fill depressions and uneven areas


Brand new roofs must allow for a suitable ageing period before over-coating can commence. This period depends on local ambient conditions but generally does not exceed 21 days. The use of a moisture tester will ensure that the screed is sufficiently dry – a moisture content below 5% is recommended.


As a “One-stop Insulation shop” Insulpro CC can offer insulation solutions across all temperature ranges and applications.


Tel: 011 835 2128 / 29 / 30
Address: 52 5th Street, Booysens Reserve, Johannesburg, 2091


Submission JHB