High Performance Chemical Resistant Mastic Coating

Product Description

A two-component solid epoxy mastic , high volume solid, high build, surface tolerant coating, designed to work in low to highly corrosive industrial environments (C5). Excellent adhesion on prepared steel and concrete. Exhibits excellent adhesion to moderately prepared surface, excellent water & chemical resistance. Used as primer in a multi-coat coating systems.

  • Extensive Applications
  • Tough, Durable, Easy to Maintain
  • High Volume Solids, Low Viscosity
  • Excellent Chemical Resistance
Colour Grey, White
Finish Semi Glossy
Volume Solids 80 ± 5 %
Mixing Ratio 9:1 (Part A : Part B) by weight
Pot Life 45-60 minutes @ 30°C
Typical Film Thickness 150μ dry on steel. 70-100μ on Concrete
Theoretical Coverage 5 Sq.m/liter at 150μ DFT
Method of Application Airless spray, Conventional Spray, Roller, Brush
Touch Dry 3-4 hours
Hard Dry 8-12 hours @ 30°C
Full Cure 7 Days
Minimum Over-coating Interval 4 hours at 30°C
Maximum Over-coating Interval 72 hours at 30°C
Surface should be clean and dry prior to over-coating. Chalking, if any, must be removed. If Aqua Mastic has been exposed for long periods, fresh water washing should be conducted before application of any coatings.

Systems and Compatibility

Aqua Mastic may be used as a standalone coating system, in which case, it must be applied at a thickness of 200 microns minimum.

Aqua Mastic maybe over coated with AQUA ST, AQUA ST-03, AQUA SEALER, AQUA PU, HULL KOAT, HULL JET, AQUA SPC, AQUA GF.

For more product and system recommendations, please consult Flosil-BET Coatings (India) Pvt Ltd.

Abrasion Resistance Max 90mg weight loss per 1000 cycles - 1kg load - CS10 Wheel - ASTM D4060
Impact Resistance 27 Joule - ASTM D2794
Dry Heat Resistance 120°C - ASTM D2485 after full cure
Pull - Off Adhesion 10.66 Mpa - ASTM D4541
Scratch Hardness 12.5 kg Load - No Failure - (BS3900 Part E2)
Salt Fog Resistance Excellent, Unaffected after 1000 hr Exposure - ASTM B117
Cyclic Fog / UV Exposure Excellent, Unaffected after 1000 hr Exposure - ASTM 5894-05

Possible Applications

  • Marine and Offshore structural steel
  • Oil & Gas Industries
  • General & Chemical Industries
Air Temperature 5-50°C
Substrate Temperature 5-65°C
Relative Humidity 50% minimum, 85% maximum
Surface temperature shall always be at least 3°C above Dew Point. Do not expose the coated articles where there are chances of condensation on the surface.


Aqua Mastic is supplied in 2 parts, a liquid binder (Part A) and a liquid curing agent (Part B). Always mix curing agent (Part B) into the liquid binder (Part A) while stirring. 75-100 RPM mixer is recommended.

Surface Preparation

All surfaces to be coated shall be dry and free from oil, grease, dust, dirt and any foreign matter that can adversely affect adhesion of coating. Solvent cleaning as per SSPC SP1 shall be conducted wherever necessary.

Steel Substrates

Surface shall be prepared by hand/power tool to achieve ST2 / ST3 standard of surface preparation as per ISO 8501-1. Any tightly adhering old coating may remain on surface. For larger surface areas, abrasive blasting may be carried out to achieve Sa 1 or Sa 2 as per ISO 8501-1 depending on project specification.

New Concrete

New concrete must be allowed to cure for minimum of 28 days. Any laitance or efflorescence must be removed prior to coating. New concrete may be acid etched to create sufficient anchorage for coating. Wash the substrate until neutral.

Old Concrete

Old concrete must be inspected for structural strength prior to application of Aqua Mastic. Any old and aged coating must be inspected for loss of adhesion. If such condition prevail, it is imperative to remove old coating prior to application of Aqua Mastic. Any tightly adherent coating may remain on the substrate.


Aqua T01 – 10 - 20 %

Application data

Steel Substrate

Preferably apply first coat of Aqua Mastic with brush. If in case of large surface area, Aqua Mastic may be sprayed, however, care shall be taken to ensure application of stripe coat of Aqua Mastic. Apply in even and uniform pattern. Do not exceed recommended wet film thickness per coat.

Application over Inorganic Zinc Silicate Primer (Aqua IZ 16-07)

For application over inorganic zinc silicate, it is recommended to apply a mist coat of Aqua Mastic prior to application of full coat.

Application over Concrete

The first coat on concrete is expected to be soaked inside the concrete. To achieve this, Aqua Mastic may be diluted maximum 20% using Aqua T01 and a thin coat (~50μ) may be applied on concrete. Allow to dry for 4 hours before overcoating with Aqua Mastic full coat.

Airless Spray

Recommended. Tip range: 0.43-0.58 mm at 3500 - 4000 psi tip pressure.

Conventional Spray

Recommended. Do not exceed spray pressure than 4 Kg/Sq.Cm

Brush / Roller


Available worldwide through Flosil - BET Coatings (India) Pvt Ltd.

Standard Packing Size = 4L (Mix Paint). Larger pack sizes of 20 L & 16 L available on request.

Shelf Life: 12 months* from the date of manufacturing.

*Material to be stored in sealed and unopened containers in closed shelter.


Before application of Aqua Mastic

After Aqua Mastic application


Before Aqua Mastic Application

After Aqua Mastic application


No:40, Velichai Village,
Vandalur – Kelambakkam Road,
Chennai – 600 048.