STP ShaliProtek HR BT 200
A water-based, fibre-reinforced bituminous emulsion that protects buried concrete and steel from moisture, industrial fumes and saline attack.
What is it?
A clay-type bituminous emulsion loaded with inert fillers and fibres that dries to a tough, impermeable black film on concrete and metal.
Where is it used?
Foundations, retaining walls, bridge abutments, buried concrete and steel members, and other structures needing an economical protective barrier.
Why use it?
It seals out water, shrugs off temperature swings, and resists industrial fumes and coastal salinity, all from a low-odour, water-based product.
How is it applied?
Brush or trowel a 1:1 water-diluted priming coat, let it break to black, then apply one or two full coats at 0.6-0.9 kg per square metre.
About STP ShaliProtek HR BT 200
STP ShaliProtek HR BT 200, which many site engineers still know by its earlier name ShaliKote BT, is a water-based bituminous protective coating built for the parts of a structure that never see daylight but take a constant beating from moisture. It is a clay-type bituminous emulsion carrying inert fillers and short fibres, and once the water carrier evaporates it leaves behind a continuous brown-to-chocolate film that turns jet black as it cures. That film is impermeable to water and holds up well against the temperature swings, industrial fumes and salt-laden air that quietly corrode unprotected concrete and steel.
What makes it a practical choice on Indian sites is the combination of performance and handling. Because it is water-based, it carries a low odour and needs no flammable solvents, so it can be applied in confined pits and basements without the ventilation headaches of coal-tar or solvent systems. The fibres give the wet emulsion enough body to be brushed or trowelled onto vertical faces without heavy sagging, and the same fibres help the cured coat bridge fine surface irregularities. Supplied ready to use in 20 kg and 200 kg drums, it suits both small repair crews and large substructure jobs.
The technical insight
The coating works on the principle of a bituminous emulsion “breaking.” In the drum the bitumen exists as fine droplets suspended in water, stabilised by the clay and emulsifying system, which is why it stays brushable and low-odour. Once spread thin on a porous surface, the water is drawn into the substrate and lost to evaporation; this destabilises the emulsion so the bitumen droplets coalesce into a single continuous membrane, visibly shifting from brown to black as the film sets. The inert fillers add solids so each coat builds real thickness rather than a thin skin, and the fibres act as internal reinforcement, giving the film cohesion and helping it resist cracking under thermal movement. Diluting the first coat 1:1 with water lets the thinned bitumen penetrate and key into the pores of the concrete, forming a bonded primer layer that the heavier finishing coats grip onto. The end result is a flexible, temperature-tolerant barrier rated to resist up to 200 degrees Celsius that keeps water, dissolved salts and aggressive vapours away from the reinforcement.
Where it is used
- Damp-proofing and external protection of foundation concrete and plinth beams
- Coating of retaining walls and basement walls on the earth-retaining face
- Protection of bridge abutments, piers and buried substructure elements
- Anti-corrosion coating for buried or embedded mild-steel and metal surfaces
- Protection of concrete water-retaining and sump structures against seepage
- Barrier coating for structures exposed to industrial fumes or coastal saline air
- Priming and sealing of rough concrete before backfilling
- Vertical and overhead protective coating where a non-sag bituminous film is needed
Key advantages
- Water-based and low-odour, safe to apply in basements, pits and confined areas
- Dries to a fully impermeable film that keeps water and vapour off the substrate
- Fibre reinforcement improves cohesion and resistance to fine cracking
- Withstands temperature fluctuations and dry heat up to 200 degrees Celsius
- Resists industrial fumes and saline atmospheres common on coastal and plant sites
- Thixotropic body allows brush or trowel application on vertical faces with minimal sag
- Bonds to both concrete and metal, covering mixed substructure details in one product
- Economical protection with a straightforward, tools-and-water application
Limitations & considerations
- Not solvent-resistant; never thin or clean it with solvent-based thinners
- Water-based cure means it needs dry, above-10-degree conditions and cannot be applied on wet or rain-threatened surfaces
- Bituminous coatings are not UV-stable and should be backfilled or concealed, not left permanently exposed to sunlight
- It is a protective barrier, not a structural crack-bridging membrane for moving joints
- Cracks and depressions must be repaired first, as the coating alone will not fill structural defects
- Rated to 200 degrees Celsius only; not a substitute for high-heat coatings on furnace or boiler casings
Selection & best practice
Start with a genuinely clean, sound surface: blow off dust, flakes, oil and grease with dry compressed air and make the substrate smooth before you open a drum. Repair visible cracks and fill depressions with a 1:4 cement-sand mortar gauged with ShaliCrete, and let those repairs set. For the priming coat, dilute ShaliProtek HR BT 200 roughly 1:1 with clean water to a light, brushable consistency and work it well into the pores. Allow the primer to dry and turn from brown to black before applying the neat coating, and again wait for the emulsion to break and blacken before the next coat. Expect roughly 0.6-0.8 kg per square metre per coat on concrete and 0.8-0.9 kg on metal, building about 150-200 microns dry film per coat; apply a second coat where fuller protection is wanted. Keep application between 10 and 40 degrees Celsius, smoothen the wet film with a water-moistened brush if needed, and let the coating cure fully before backfilling or covering.
Specifications
| Composition | Clay-type bituminous emulsion with inert fillers and fibres (water-based) |
| Colour | Brown to chocolate (turns black on curing) |
| Density | 1.10 g/cc |
| Hard drying time | 24 hours at 27 degrees C, 55% RH |
| Temperature resistance (max) | 200 degrees C |
| Application temperature | 10 – 40 degrees C |
| Theoretical coverage per coat | 0.8-0.9 kg/m2 on metal; 0.6-0.8 kg/m2 on concrete |
| Dry film thickness per coat | 200 microns on metal; 150 microns on concrete |
| Packing / shelf life | 20 kg and 200 kg drums; 12 months sealed |
Industry use cases
Building Substructure
Damp-proofing and protecting foundations, plinths and basement retaining walls before backfilling.
Infrastructure & Bridges
Barrier coating on abutments, piers and buried substructure elements exposed to soil moisture.
Industrial Plants
Protecting buried concrete and steel against industrial fumes and aggressive process atmospheres.
Coastal & Marine-adjacent
Shielding structures from saline air and salt-laden moisture along coastal sites.
Water & Sanitation
Seepage protection for sumps, tanks and buried water-retaining concrete structures.
Frequently asked questions
Is ShaliProtek HR BT 200 the same as the old ShaliKote BT?
How much coating do I need per square metre?
Can I apply it on damp or freshly cast concrete?
Do I need a separate primer?
Can it be left exposed to sunlight?
What pack sizes and shelf life does it have?
How we position STP ShaliProtek HR BT 200
ShaliProtek HR BT 200 is the economical, water-based workhorse of STP’s bituminous protective range. Where a job runs hotter, step up to ShaliProtek HR BT 300, STP’s heat-resistant UIC coating rated to 300 degrees Celsius for furnace casings and under-insulation pipe protection; for exposed roof and terrace waterproofing consider STP’s ShalisealWP acrylic or an APP membrane instead of a below-ground bituminous coat. If a client is standardised on the Fosroc range, we also supply the equivalent solvent-based bituminous coating from that family. Because Space Arc carries STP, Fosroc, Sika, Dr. Fixit and other lines side by side, we can match the coating to the substrate, exposure and specification rather than to whatever a single brand happens to stock.
Fosroc Nitoproof 100 — Choose the Fosroc option when the specification calls for a solvent-based bituminous coating or the project is already standardised on the Fosroc protective-coatings range.
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