Waterproofing and Concrete Protection Experts
Mob: +971 50 883 00 41 Tel: +971 4 380 62 66   Email: sales@indexemirates.com


Acrylic Modified Micro Fibre Reinforced White Cement based UV Resistant Cementitious Spray Waterproofing.pdf icon

INDOFLEX COMBO PLUS is a two-part acrylic modified microfibre reinforced, white cement based spray waterproofing membrane for protecting concrete structures against Water, vapor, ingress of chloride ions, attacks of acidic gases and alkalis. It cures to form a tough flexible coating having excellent waterproofing properties. INDOFLEX COMBO PLUS PLUS is a blend of cement, selected fillers, polymers, and graded silica sand, which is in powder form. The liquid part contains acrylic copolymers and Wetting agents.


  • Good flexibility. Thermal co-efficient of expansion to accommodate concrete movements.
  • Good adhesion to both porous and non-porous surfaces.
  • Good mechanical properties.
  • Good abrasion resistance. Suitable for pedestrian traffic.
  • High durability to long term weathering effect and UV.
  • Nontoxic, therefore suitable for potable water applications.
  • Resistant to carbon dioxide and chloride ion diffusion. (Forms a film that provides an anti-carbonation coating over concrete. A 1mm coating provides anti-carbonation cover which is equivalent to over 75 cm of concrete).
  • Can be applied to 24 hours old concrete, thereby giving immediate protection to the concrete.
  • Allows the substrate to breathe.
  • Can withstand negative and positive water pressure.
  • Spray grade. Hence faster and foolproof application.


  • Waterproofing for large roofs both exposed and in-concrete.
  • For hardscapes and driveways of large podiums/basement roofs.
  • For wet area waterproofing.
  • For waterproofing retaining walls in wet and dry conditions.
  • Internal and external waterproofing of potable water reservoirs.
  • Good anti-carbonation protective coating to exposed concrete structures.
  • Protective coating on structures exposed to seawater.
  • Sealing light aerated blocks, pre-cast joints.
  • Waterproof coating on roofs, domes, tunnels, swimming pools, lift Wells, spillways, Surge shafts, pre-cast slabs and other wet areas.
  • Specially designed for permanent bonding.

(The properties shown below were obtained under laboratory conditions)
Color: Off White
Mixed Density [g/cc] ASTM D 1475: 1.4 ± 0.02
Pot life @ 30°C (min): 45
Tensile strength [N/mm²] ASTM D 412: ≥3.5
Elongation, (%) ASTM D 412: >250
Abrasion resistance ASTM D 4060: <50gms
CO₂ diffusion resistance NT BUILD 372: ≥50m
Toxicity BS 6920: Non-toxic
Water permeability:
Positive @7 bar: Nil
Negative @ 3 bar: Nil
BS 12390
Crack bridging ability [mm] ASTM C 836: >3
Adhesion to concrete [N/mm²] ASTM D 4541: >1
Chemical resistance ASTM D 543: pH 2.5-11.5
Initial cure@ 25°C & 50% RH, [hours]: 6-8
Full cure@ 25°C & 50% RH, [days]: 7
Application temperature: 5°C to 45°C
Service temperature: O°C to 70°C
All values given are subject to 5-10% tolerance

Surface Preparation
The surface must be structurally sound and free of oil and grease, dust, and other contaminants that will affect the bonding. Any structural cracks or potholes shall be repaired with a suitable repair mortar from the SPADREP range of repair mortars. Light mechanical grinding or high-pressure water jet cleaning of the concrete surface can be done to remove any contaminants from the surface. The surface to be treated should be pre-saturated with water prior to application. However, remove any standing water from the concrete surface just before applying the coating.

INDOFLEX COMBO PLUS is supplied in two pre-measured parts which just requires on-site mixing. Do not mix more material than that can be used within the pot life. Part mixing can be carried out by mixing 1 volume of powder to 1 volume of liquid. Pour the liquid into a suitable container and slowly add the powder to the liquid. Mix the contents using a slow speed drill (300-400 rpm) fitted to a proprietary paddle mixer until a lump-free creamy consistency is obtained. DO NOT ADD WATER TO DILUTE THE MATERIAL AT ANY STAGE.

It is recommended to apply INDOFLEX COMBO PLUS PLUS in two coats to provide a minimum thickness of 2mm for heavily trafficked areas, exposed locations, and water retaining structures, 1.4mm for podiums, large roofs, and retaining walls, and 1-1.2mm for in-concrete medium/small roofs and podiums. Each coat shall be applied @ 750g/m² which will give a DFT of average of 1mm for 1.50kg. The product is best applied with a stiff brush or an airless spray of nozzle size of 3- 4mm and a pressure of 6-7 bars. After the application of the first coat and whilst it is still wet, embed a glass fiber mat in all the corners and other joints for added reinforcement. The second coat shall be applied after the first coat dries.

The coating shall be cured immediately after it dries by wet hessian cloth or mist spraying for a minimum period of 72 hours. The coating will achieve its full mechanical properties within 7 days at 25°C & 50% RH.

Clean all tools immediately with water after use. Hardened materials can be removed mechanically only.

INDOFLEX COMBO PLUS is a two-part kit.
1.Part A 10 kg bag
2.Part B 10 lt. pail

750g/m²/coat will give 0.5mm Dry Film thickness. Please apply two coats to get 1mm thickness.

Store the material in a covered and shaded area. Protect from sunlight, UV and extreme temperatures. In tropical conditions the product shall be stored in air-conditioned environments. The shelf life is 12 months when stored as per recommendation and in un-opened conditions. Prolonged exposure to heat and humidity will result deterioration of the quality of the product and reduce its shelf life.

As with all construction chemical products caution should always be exercised. Protective clothing such as rubber gloves and safety goggles should be worn. Treat any splashes to skin or eyes with fresh water immediately. Should any of the products be accidentally swallowed, do not induce vomiting but call for medical assistance immediately.

© 2021 Index Emirates All Rights Reserved.