STP ShaliProtek 2E MIO 40
A two-component, high-build polyamide epoxy pigmented with micaceous iron oxide, built to shield structural steel in aggressive coastal and industrial atmospheres.
What is it?
A two-pack (2K) polyamide-cured epoxy coating pigmented with micaceous iron oxide (MIO), used as a primer or intermediate barrier coat on steel. Formerly sold as ShaliPoxy MIO.
Where is it used?
Structural steelwork in coastal and industrial atmospheres — refineries, fertiliser plants, petrochemical and chemical units, storage tanks, silos, conveyors, ship loaders and pipelines.
Why use it?
The flake-shaped MIO pigment overlaps to form a dense lamellar barrier that slows water and vapour ingress, while the polyamide cure adds abrasion and impact resistance at 75-100 micron DFT.
How is it applied?
Mix Component A and B, let entrapped air escape, then apply by airless spray or brush over prepared steel. Overcoat with epoxy or polyurethane after the 12-hour minimum interval.
About STP ShaliProtek 2E MIO 40
ShaliProtek 2E MIO 40 sits in the middle of a protective coating stack rather than at either end of it. STP builds it as a two-component polyamide epoxy loaded with micaceous iron oxide, the grey, flaky pigment that has been trusted on bridges and heavy steel for decades. Those platelets lie down flat and overlap inside the film, so moisture and vapour have to travel a long, winding path to reach the steel underneath. On site, engineers and applicators know it under its older name, ShaliPoxy MIO — the chemistry is the same product, now carried under the ShaliProtek naming used across STP’s protective range.
What makes it practical for Indian project sites is its flexibility of position. The data sheet allows it to serve either as a primer or as an intermediate coat, which means a single tin can do slightly different jobs depending on how the specification is written. In a full system it usually goes over a zinc-rich or epoxy primer and under a polyurethane or epoxy finish, adding film build and a genuine barrier layer in the middle. It cures cold, so no ovens or heat are needed, and it accepts both brush and airless spray — a useful combination when part of a job is open steelwork and part is tight, awkward detail that a spray gun cannot reach cleanly.
The technical insight
The performance of this coating is a story about pigment shape more than resin chemistry. Ordinary pigments are roughly spherical and pack loosely, leaving relatively direct routes for water and dissolved salts to diffuse down to the substrate. Micaceous iron oxide is different — it is a naturally lamellar (plate-like) form of iron oxide, and during film formation those plates settle roughly parallel to the steel surface. Stacked in overlapping layers, they behave like tiles on a roof, forcing any moisture that penetrates the binder to detour sideways around each flake instead of moving straight through. That extended diffusion path is what STP means by a barrier against water and water-vapour penetration, and it is the same principle that has kept MIO coatings on structural steel for generations. The polyamide-cured epoxy binder contributes the other half: polyamide curing agents give a film that stays flexible and adheres tenaciously, so the coating tolerates the thermal movement, vibration and knocks that plant steel sees without cracking or disbonding. At a specified 75-100 micron dry film thickness and roughly 42 percent volume solids, one properly applied coat delivers meaningful build, and because it is designed to be overcoated with epoxy or polyurethane, it forms the resilient heart of a multi-coat system rather than a standalone finish.
Where it is used
- Anti-corrosive protection of structural steel in aggressive coastal and industrial atmospheres
- Intermediate barrier coat over zinc-rich or epoxy primers, under epoxy or polyurethane topcoats
- Ship loaders and other heavy handling steelwork exposed to salt-laden air
- Hoppers, conveyors, silos and storage tanks in bulk-material and process plants
- Pipelines and general steel structures in fertiliser plants and refineries
- Steelwork in petrochemical, chemical and process-engineering units
- Structural steel in engineering industries needing extended film build and moisture resistance
- Above-ground plant steel where a durable, overcoatable mid-layer is specified
Key advantages
- Lamellar MIO pigment creates a genuine barrier that slows water and water-vapour ingress
- Polyamide cure keeps the film flexible with strong adhesion to primed steel
- Good resistance to abrasion and impact once fully cured
- High-build capability delivering 75-100 micron DFT in a single coat
- Cold-curing chemistry — no heat or oven required, suited to open site work
- Flexible role: usable as either a primer or an intermediate coat
- Applies by both airless spray and brush, covering open steel and tight detail
- Overcoatable with epoxy or polyurethane, integrating into standard protective systems
Limitations & considerations
- It is not a standalone finish — a matt MIO layer needs an epoxy or polyurethane topcoat for weathering and appearance
- Being epoxy-based, the film will chalk and lose gloss under prolonged UV if left unprotected
- Two-pack product with a 4-6 hour pot life at 30°C, so mixed material must be used within the working window
- Performance depends heavily on surface preparation — blast-cleaned steel to the specified profile gives the best result
- Application is restricted to a substrate temperature range of above 10°C to below 50°C
- Overcoating too early (before the 12-hour minimum) or too late (after 7 days) risks intercoat adhesion problems
Selection & best practice
Start with the steel, not the tin. On new fabrication, blast-clean to a surface profile not exceeding 65 microns; on existing steel where blasting is impractical, use mechanical tools with manual chipping and wire brushing to remove all loose rust, then avoid over-burnishing the surface and dust it down thoroughly with clean hot air. Mix Component A (resin) on its own with a spiral-blade speed drill at 350-400 rpm until homogeneous, then add Component B (hardener) slowly and continue stirring; once blended, wait 10-15 minutes so entrapped air can escape before you start. Apply at a substrate temperature above 10°C and below 50°C to a target 75-100 micron DFT. For airless spray, use a 27-thou nozzle with a 30-mesh filter at 110-160 kg/cm² tip pressure; brush application suits repairs and detail. Respect the overcoat window — a minimum of 12 hours and a maximum of 7 days before the epoxy or polyurethane finish. Wear gloves and eye protection, keep the area ventilated, and store tins cool, dry and under shade; shelf life is 12 months in the original sealed 20 L container.
Specifications
| Type | Two-component (2K) high-build polyamide epoxy, MIO-pigmented |
| Colour / Finish | Brown / Grey, matt finish |
| Dry Film Thickness (DFT) | 75-100 micron per coat |
| Theoretical Coverage | 6 ± 0.5 m² per litre (depending on surface condition) |
| Volume Solids | 42 ± 3% |
| Pot Life | 4-6 hours at 30°C |
| Drying Time | Touch dry 4-6 hours; full cure 7 days |
| Overcoating Interval | Minimum 12 hours, maximum 7 days |
| Packing / Shelf Life | 20 L container; 12 months in sealed condition |
Industry use cases
Refineries & Petrochemicals
Serves as the MIO barrier layer on process steelwork, pipe racks and structures exposed to a mix of chemical vapour and coastal humidity.
Fertiliser & Chemical Plants
Protects hoppers, conveyors, silos and pipelines where an aggressive process atmosphere would otherwise accelerate corrosion of bare or under-built steel.
Ports & Marine Handling
Coats ship loaders and heavy handling steel in salt-laden air, adding both film build and impact resistance ahead of a polyurethane finish.
Storage & Bulk Terminals
Builds a durable mid-coat on storage tanks and structural steel where long recoat cycles make a strong barrier layer economically worthwhile.
Heavy Engineering & Fabrication
Applied in the shop or on site over primed steel as the intermediate coat in a specified three-coat protective system.
Frequently asked questions
Is ShaliProtek 2E MIO 40 the same as the old ShaliPoxy MIO?
Can I use it as a primer, or only as an intermediate coat?
What topcoat should go over it?
What DFT and coverage should I plan for?
How should the steel be prepared?
What pack size does it come in and how long does it keep?
How we position STP ShaliProtek 2E MIO 40
ShaliProtek 2E MIO 40 is the workhorse mid-coat in a full STP anti-corrosive system. Pair it under an STP epoxy or polyurethane finish, and where a higher intermediate film build is wanted, its sister product ShaliProtek 2E MIO 60 offers the same MIO chemistry at a heavier DFT. For the primer beneath it, a zinc-rich or epoxy primer from the STP ShaliProtek range completes the stack. If your project runs on a Fosroc specification instead, Space Arc also carries the Fosroc Nitocote family as a direct alternative — we distribute both brands, so the choice can follow the consultant’s approved-vendor list rather than what is on the shelf.
Fosroc Nitocote EP140 (M) — Choose the Fosroc option when the specification or approved-vendor list is built around Nitocote, as EP140 (M) is a near-equivalent MIO-reinforced epoxy-polyamide coating (~80 micron DFT) for steel and concrete.
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