STP ShaliProtek 2E 65 MI
A self-priming, two-pack phenolic epoxy that bonds and cures on green concrete and moist steel where ordinary epoxies fail, delivering acid, alkali and chemical protection in high-humidity zones.
What is it?
A 2K moisture-insensitive, amine-based phenolic epoxy protective coating from STP that is self-priming and tolerant of damp substrates.
Where is it used?
Damp or green concrete, moist steel, RH above 85%, and under-prepared surfaces in secondary containment, trenches, pump pads, bridges and chemical-exposure zones.
Why use it?
It resists acid and alkali vapours, cures in high humidity and at low temperature, and eliminates a separate primer coat on many substrates.
How is it applied?
Mix Component A and B at 3:1 by volume, wait 5 minutes for air release, then brush, spray or apply with a short-nap roller at 100 microns DFT.
About STP ShaliProtek 2E 65 MI
STP ShaliProtek 2E 65 MI is a two-component phenolic epoxy coating built specifically for the situations Indian sites run into most often: a substrate that will not fully dry, a monsoon window that has closed, or a shutdown deadline that leaves no time to wait for green concrete to season. It is amine-cured and formulated to be moisture-insensitive, so it develops a proper mechanical bond over damp concrete, moist steel and surfaces where relative humidity sits above 85%. Because it is self-priming, a single system can often act as both primer and protective film, cutting one full application cycle off the programme. STP supplies it in Red and Grey, which also makes coat-by-coat inspection straightforward on large containment and structural jobs.
Beyond simply tolerating moisture, the coating is engineered for aggressive service. The cured film shows high impact resistance and stands up to the splash and spillage of corrosive chemicals and solvents at elevated temperature, which is why it is a common choice for secondary containment bunds, solvent storage areas, pump pads, trenches, bridge under-decks and piling. It carries a low VOC of 220 g/L and passes 2000 hours of salt-spray testing, giving specifiers a documented basis for long-term corrosion protection. Space Arc Engineering supplies and applies it as an authorised STP distributor across Delhi NCR and Pan-India, with technical support on substrate assessment, priming and DFT verification.
The technical insight
The performance rests on two design choices. First, the phenolic (novolac-style) epoxy backbone gives a densely cross-linked, aromatic film that resists acid and alkali attack far better than a standard bisphenol-A epoxy, which is what lets it survive acid and alkali fumes at temperature in annealing, fertiliser and leather-processing plants. Second, the amine curing agent is selected to be moisture-insensitive: rather than being poisoned by surface water, it tolerates damp and green concrete and continues to cure at low temperature and humidity. That combination is why STP rates it for adhesion of over 2.6 N/mm2 on green concrete and over 8.0 N/mm2 on metal, and why it can prime and coat in a single system. At 68 ± 2% volume solids it builds a robust 100-micron film per coat at a theoretical 6.6 to 7.0 m2/L, while the tight 3:1 mix ratio and 55 to 65-minute pot life at 27C keep on-site cure predictable.
Where it is used
- Secondary containment bunds and solvent storage areas exposed to chemical splash and spillage
- Pump pads, trenches and equipment plinths in process plants
- Bridge under-decks and piling where substrates stay damp
- Moist steel and concrete in ammonium sulphate, annealing, acid and fertiliser plants
- Coating over green (freshly cast) concrete where drying time is unavailable
- Leather-processing units and other high-humidity, acid or alkali fume environments
- Anti-carbonation coating on reinforced concrete structures
- Protective lining in confined or poorly ventilated damp zones
Key advantages
- Moisture-insensitive: bonds and cures on damp, green concrete and moist steel
- Self-priming, so one system often serves as both primer and protective coat
- Excellent resistance to acid and alkali vapours from the phenolic epoxy backbone
- Bonds well even at low temperature and high humidity
- High impact resistance and passes 2000-hour salt-spray corrosion testing
- Low VOC at 220 g/L for confined-space and indoor work
- Strong documented adhesion: over 2.6 N/mm2 on green concrete, over 8.0 N/mm2 on metal
- Two-tone Red and Grey supply aids visual coat-by-coat inspection
Limitations & considerations
- Not for surfaces with standing or running water; it tolerates dampness, not free water
- Pot life is only 55 to 65 minutes at 27C, so mix in workable batches
- Steel still needs blast cleaning to SA 2.5; it forgives moisture, not poor surface prep
- Ambient temperature must stay within 15 to 50C during application
- Two-component product requiring accurate 3:1 mixing and mechanical stirring
- Shelf life is 12 months in unopened, sealed packs stored cool and dry
Selection & best practice
Remove dust, flakes, oil and grease with dry air, then hose the surface with fresh water before abrasive blasting steel to at least SA 2.5 (near-white for non-immersion, white metal for immersion). Stir Component A to a homogeneous mix with a spiral-blade speed drill, add the full factory pre-weighed Component B at 3:1 by volume, mix thoroughly and wait 5 minutes for entrapped air to escape. Work only when ambient temperature is 15 to 50C in a well-ventilated area. Although the product is self-priming, STP recommends priming concrete with ShaliPrime PUM and metal with ShaliPrime Zn Ph 60, allowing the primer to dry fully first. Apply by brush, spray or short-nap squeegee roller at 100 microns DFT, and respect the 6 to 18-hour recoat window before the next coat.
Specifications
| Type | 2K moisture-insensitive amine-based phenolic self-priming epoxy |
| Colour | Red / Grey |
| Volume solids (ASTM D 2967) | 68 ± 2% |
| Theoretical coverage | 6.6 – 7.0 m2/L at 100 microns DFT |
| Mixing ratio | 3 : 1 by volume (Component A : B) |
| Pot life at 27C | 55 – 65 minutes (100 g mix) |
| Drying at 30C, 85% RH | Surface dry 3 ± 1 hrs; recoat 6 – 18 hrs; full cure 3 days |
| VOC | 220 g/L |
| Adhesion (ASTM D 4541) | Green concrete > 2.6 N/mm2; metal > 8.0 N/mm2 |
| Packing | 20 L unit (15 L Component A + 5 L Component B); 12-month shelf life |
Industry use cases
Chemical & Process Plants
Secondary containment, solvent storage and pump pads exposed to acid, alkali and solvent splash at elevated temperature.
Fertiliser & Metallurgical
Moist steel and concrete in ammonium sulphate, annealing and acid plants attacked by aggressive fumes.
Bridges & Infrastructure
Bridge under-decks and piling that stay damp, plus anti-carbonation protection on reinforced concrete.
Water & Effluent Structures
High-humidity, poorly ventilated damp zones where drying time is not available before coating.
Leather & Tannery Units
Corrosive, humid processing environments needing a chemical-resistant film that cures on moist substrates.
Frequently asked questions
Can ShaliProtek 2E 65 MI really be applied over damp or green concrete?
Do I still need a separate primer?
What coverage and thickness should I plan for?
What is the pot life and mixing ratio?
What chemical exposure can it handle?
How is it supplied and how long does it last in storage?
How we position STP ShaliProtek 2E 65 MI
Within the STP ShaliProtek 2E family, choose 2E 65 MI when the deciding factor is a damp or green substrate. Where the concrete is fully dry and you need a flexible, high-build finish, ShaliProtek 2E PA 80 (polyamide, ~82% solids) or the higher-build 2E PA 120 are better fits, while ShaliProtek 2E MIO 40 and MIO 60 serve as micaceous-iron-oxide intermediate coats in a multi-coat steel system. For metal priming ahead of this coat, pair with ShaliPrime Zn Ph 60, and for concrete use ShaliPrime PUM. If a project specification calls for a Fosroc system, Space Arc also supplies the equivalent moisture-tolerant Fosroc range as an authorised distributor, alongside our Sika, Dr. Fixit and MC-Bauchemie protective-coating lines.
Fosroc Nitocote EP403 — Specify the Fosroc EP403 when the job calls for a solvent-free, 100% solids damp-tolerant epoxy at 400 microns DFT and the specification names Fosroc, rather than STP’s self-priming phenolic system.
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