STP TankMastic 700
A single-pack bituminous coating that lays down a full 700-micron dry film in one pass, protecting steel, concrete and water-tank interiors from corrosion without the labour of multi-coat systems.
What is it?
A solvent-based, high-build bituminous anti-corrosive coating from STP (formerly TankMastic HB) that builds 700 microns of dry film in a single application and cures to a tough, tasteless, odourless black barrier.
Where is it used?
Internal and external surfaces of steel and masonry water tanks, buried piling and foundation steel, pipework, and industrial concrete structures needing heavy corrosion protection.
Why use it?
One coat replaces several thin coats, cutting application time and inter-coat waiting while delivering a thick, continuous film with dependable thickness control.
How is it applied?
Stirred to a homogeneous mix, then applied by brush, roller or airless spray onto a clean, dry, sound substrate in a single high-build pass.
About STP TankMastic 700
TankMastic 700 is STP Limited’s high-build member of the TankMastic family, carried forward from the earlier TankMastic HB designation. Where the standard TankMastic and the 100-micron variant are built for thinner films, the 700 grade is formulated so a single spray or brush pass deposits a full 700 microns of dry film. That single-coat thickness is the whole point of the product: on large tanks, pilings and buried steelwork, getting to a heavy protective build in one operation removes the stop-start rhythm of applying, waiting to recoat, and applying again. It is a single-pack, solvent-based bitumen coating that is tasteless, odourless and non-toxic when cured, and it dries to a hard black film that resists water, mild acids and alkalis.
For Indian sites, the practical appeal is straightforward. Contractors handling potable and non-potable water tanks, consultants specifying corrosion protection for foundation and marine piling, and industrial clients coating pipes and plant steel all want a thick, continuous barrier without the cost of a multi-layer paint system. TankMastic 700 answers that by conforming to IS 9862-1981 and IS 158-1981, the same standards the wider TankMastic range is built to, and by being suitable for surfaces in contact with fresh or salt water. Space Arc Engineering supplies it as an authorised STP distributor and applicator across Delhi NCR and pan-India, so the material comes with sizing, coverage and application guidance rather than just a drum on a pallet.
The technical insight
Corrosion protection from a bituminous coating is a game of film continuity and film thickness. Bitumen works as a barrier: it keeps water, oxygen and dissolved salts away from the steel, and the thicker and more pinhole-free the film, the longer the metal stays passive. Thin coatings fail first at high spots, weld seams and edges where the film draws thin, so multi-coat bitumen systems exist mainly to build enough total thickness to cover those weak points. TankMastic 700 attacks the same problem differently. By carrying enough solids to deposit 700 microns of dry film from one application, it reaches heavy-duty barrier thickness without relying on the applicator to perfectly stack three or four separate coats. Each recoat interface in a multi-coat job is a potential adhesion or holiday risk; collapsing that into a single high-build pass removes those interfaces. The trade-off, common to all thick single-coat bitumens, is that solvent has to escape from a deep film, so the coating is engineered to cure to a hard film while still allowing that release. This is why substrate cleanliness and low moisture matter so much: a thick film over grease, dust or a damp surface loses the very continuity and adhesion the thickness was meant to provide.
Where it is used
- Internal lining of masonry and steel water storage tanks, including potable-water tanks where a tasteless, odourless, non-toxic film is required
- External corrosion protection of buried and above-ground steel foundation and piling
- Anti-corrosive coating of industrial and conduit pipework carrying water or exposed to damp ground
- Protection of plant steel, equipment and machinery bases against acid, alkali and moisture attack
- Damp-proofing and corrosion protection of concrete structures in contact with fresh or salt water
- Heavy-duty barrier coating on structures where a single high-build coat is specified to reduce application cycles
- Marine and coastal steelwork requiring low moisture permeability and water repellence
- Refurbishment recoating of previously bitumen-coated tanks and steel surfaces
Key advantages
- Builds a full 700-micron dry film in a single coat, removing several recoat cycles from the programme
- Cuts labour time and inter-coat waiting compared with stacking multiple thin coats
- Tasteless, odourless and non-toxic when cured, making it suitable for potable-water tank interiors
- Single-pack and ready to use, applied straight by brush, roller or airless spray after stirring
- Conforms to IS 9862-1981 and IS 158-1981
- Low permeability to moisture with excellent water repellence, including surfaces in contact with fresh or salt water
- Cures to a hard black film with good resistance to water, mild acids and alkalis
- Protects both steel and masonry/concrete substrates from a single product on mixed-material jobs
Limitations & considerations
- A solvent-based bitumen, so it is flammable during application and needs good ventilation and no ignition sources on site
- Not a decorative or UV-stable finish; the black film is a barrier coating, not an aesthetic or long-term weathering topcoat
- Requires a clean, structurally sound substrate with moisture content below about 5% to develop proper adhesion and continuity
- As a thick single-coat bitumen, deep films demand disciplined application and adequate cure before exposure to service loads or chemicals
- Should not be exposed to oils, aggressive chemicals or mechanical stress until fully cured
- Periodic maintenance recoating is needed over the service life to sustain continual corrosion protection
Selection & best practice
Prepare the surface first: remove all dust, oil, grease, curing compounds and loose or friable material, and repair concrete defects before coating. Confirm the substrate is dry (moisture below roughly 5%) and apply within a workable substrate and ambient temperature window (the TankMastic range is worked around +5 to +45 degrees Celsius). Stir the drum thoroughly to a homogeneous mix, then let it stand briefly so entrapped air escapes. Apply as supplied by brush, roller or airless spray in a single high-build pass, working to full coverage without overworking the film. Ensure good ventilation, keep ignition sources away, and let the coat cure properly before backfilling, filling a tank or exposing it to chemicals or abrasion. Clean tools immediately after use with STP Thinner before the bitumen hardens, and plan a maintenance recoat later in the structure’s life to keep the barrier continuous. Always confirm potable-water suitability and coverage for your specific surface with the current STP TDS.
Specifications
| Product type | Single-pack, solvent-based high-build bituminous anti-corrosive coating |
| Dry film thickness | 700 microns in a single coat |
| Colour / form | Black, smooth liquid; tasteless, odourless, non-toxic when cured |
| Standards | IS 9862-1981, IS 158-1981 |
| Application methods | Brush, roller or airless spray |
| Substrate moisture | Less than 5% at time of application |
| Shelf life | 12 months in original sealed condition, stored cool and dry away from heat |
| Tool cleaning | STP Thinner, before the coating hardens |
| Pack sizes | 20 L and 200 L drums (confirm current availability) |
Industry use cases
Water infrastructure
Lining the interiors of masonry and steel water storage tanks with a non-toxic, tasteless film that will not taint stored water, achieved in a single heavy coat.
Foundations and piling
Protecting buried foundation steel and piling against ground moisture and corrosion before backfilling, with one high-build application per element.
Industrial plant
Coating pipework, equipment bases and plant steel exposed to damp, mild acids or alkalis where a durable bitumen barrier is specified.
Marine and coastal works
Shielding steel and concrete surfaces in contact with fresh or salt water using a low-permeability, water-repellent film.
Refurbishment
Recoating previously bitumen-protected tanks and structures during maintenance to restore a continuous corrosion barrier in fewer visits.
Frequently asked questions
Is TankMastic 700 safe for potable water tanks?
How is TankMastic 700 different from ordinary TankMastic or the 100 grade?
Why choose a single 700-micron coat instead of several thin coats?
What surface preparation does it need?
How is it applied and cleaned up?
Does Space Arc supply and apply TankMastic 700 outside Delhi NCR?
How we position STP TankMastic 700
TankMastic 700 sits at the high-build end of STP’s bituminous corrosion-protection range: choose the standard TankMastic or TankMastic 100 where a thinner film is enough, and step up to the 700 grade when a heavy single-coat build is specified. On mixed scopes, Space Arc pairs it with STP’s wider protective, waterproofing and repair systems. Where a client is standardising on Fosroc, the closest genuine counterpart is Fosroc Nitoproof 100, a solvent-based bituminous protective coating for damp-proofing and below-ground concrete; it is a thinner-film product rather than a 700-micron single coat, so the two suit different thickness requirements. For flexible below-grade membranes beyond simple bitumen, Fosroc’s Nitoproof polyurethane range is the alternative to weigh.
Fosroc Nitoproof 100 — Specify Nitoproof 100 when a project is standardised on Fosroc and a quick-drying, thinner-film bituminous damp-proof and below-ground concrete coating is sufficient, rather than TankMastic 700’s heavy 700-micron single-coat build.
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