STP ShaliPrime ERO 60
Two-component, cold-cure red oxide epoxy primer that gives blast-cleaned steel a chemically resistant anti-corrosive first coat — with the inter-coat bond your epoxy or PU topcoats need to perform.
What is it?
A 2K cold-cure epoxy primer pigmented with red iron oxide, mixed on site from base and hardener and laid down at 50–60 microns dry film per coat on prepared steel.
Where is it used?
On blast-cleaned structural and fabricated steel — plant steelwork, pipe supports, platework, equipment frames — as the first coat of a protective coating system.
Why use it?
The epoxy binder shrugs off chemical exposure that destroys alkyd red oxide primers, and its inter-coat bonding gives epoxy and PU topcoats a foundation that will not delaminate.
How is it applied?
Stir each component, blend Component B into A with a slow-speed mixer, then brush or spray one coat at 9–10 m²/L theoretical coverage; recoat after 24 hours, working above 10°C.
About STP ShaliPrime ERO 60
ShaliPrime ERO 60 is STP Limited’s two-component anti-corrosive primer for steel — a red oxide primer built on epoxy chemistry rather than the cheap alkyd binders most ‘red oxide’ paints in the Indian market still use. The distinction matters on real projects. An alkyd red oxide softens under plant chemicals and gives later epoxy coats a weak base to grip; ERO 60 cures cold into a hard, chemically durable film at 50–60 microns DFT that behaves like the first coat of an engineered system, because that is exactly what it is. STP recommends it on blast-cleaned metal, where the epoxy keys into the surface profile and locks out the moisture and contaminants that start under-film corrosion.
At 55% volume solids and a mixed specific gravity of 1.5, the product delivers a theoretical coverage of 9–10 m² per litre per coat, so a 20 L unit pack primes a substantial run of fabricated steel in a single pass. Pot life of 3–4 hours suits gang application on large structures, and the film is surface dry within 2–3 hours with a 24-hour recoat window. Space Arc Engineering stocks ShaliPrime ERO 60 as an authorised STP distributor and applicator, supplying fabricators, industrial contractors and consultants across Delhi NCR and pan-India, with application crews available where a supervised, warranted coating system is required.
The technical insight
Two mechanisms do the work here. First, the barrier: red iron oxide pigment dispersed at 30% pigment volume concentration sits comfortably below the critical PVC, meaning every pigment particle stays fully wetted by epoxy binder. The result is a dense, low-permeability film that forces water, oxygen and chloride ions to take a long, tortuous path before they ever reach the steel — starving the corrosion cell of its ingredients. Second, the cure: when Component B is blended into Component A, the hardener crosslinks the epoxy resin at ambient temperature (above 10°C) into a three-dimensional network that neither re-dissolves in solvents nor softens under chemical splash. Unreacted sites at the film surface within the recoat window are also why ERO 60 shows the excellent inter-coat bonding STP cites — the topcoat chemically ties into the primer rather than merely sticking to it.
Where it is used
- Anti-corrosive priming of blast-cleaned structural steel before epoxy or PU topcoats
- Shop priming of fabricated sections, trusses, purlins and platework at fabrication yards
- Steelwork in chemical, fertiliser and process plants exposed to aggressive fumes and splash
- Pipe racks, cable trays, equipment skids and machinery bases in industrial units
- Refurbishment priming of old, corroded steel after abrasive blasting, including salt-exposed members
- First coat on steel tank exteriors, gantries and platform structures under maintenance repainting
- Priming metal surfaces ahead of chemically resistant epoxy coating systems
Key advantages
- Epoxy binder gives excellent durability across all types of chemical environments — well beyond alkyd red oxide primers
- Excellent inter-coat bonding, so epoxy and polyurethane topcoats anchor without adhesion failure
- Red iron oxide pigmentation at 30% PVC forms a dense barrier film against moisture and oxygen
- Practical economics: 9–10 m²/L theoretical coverage per coat from a 20 L unit pack
- Workable 3–4 hour pot life lets crews mix full units for large structures without waste
- Fast turnaround — surface dry in 2–3 hours, recoatable in 24 hours, keeping painting cycles predictable
- Applies by brush or spray, so it suits both shop lines and site touch-up work
Limitations & considerations
- It is a primer only — an epoxy, PU or acrylic topcoat is essential, since exposed epoxy chalks and fades under UV
- Stated performance assumes blast-cleaned steel; over hand-wire-brushed rusty surfaces the anti-corrosive life drops sharply
- Application is restricted to temperatures above 10°C, which can constrain winter night work in north India
- Being two-component, it demands mixing discipline — material mixed beyond the 3–4 hour pot life must be discarded
- Supplied only in 20 L unit packs, so small touch-up jobs carry wastage unless batched together
- It protects by barrier action, not galvanically — where a zinc-rich primer is specified for severe exposure, it is not a substitute
Selection & best practice
Surface preparation decides how long this primer protects, so treat it as the main job. Remove oil, grease, loose gravel and foreign matter, then abrasive-blast the steel — STP names blasting as the most effective method, and on old steel that has seen salt water, wet blasting followed by dry blasting is needed to flush chloride residues out of pits. Stir each component separately with a slow-speed mixer (around 400 rpm) fitted with a proper paddle, then add Component B to Component A under continuous stirring until homogeneous. Let the mix stand briefly so entrapped air escapes — spraying an aerated mix leaves pinholes. Apply by brush or spray targeting 50–60 microns DFT, budgeting from the 9–10 m²/L theoretical figure and adding losses for profile and overspray. Keep steel temperature above 10°C, recoat after 24 hours, and do not leave the primed surface exposed indefinitely before topcoating.
Specifications
| Type | Two-component, cold-cure red oxide epoxy anti-corrosive primer |
| Colour | Brown |
| Solid content (by volume) | 55% |
| Mixed specific gravity | 1.5 ± 0.02 |
| DFT per coat | 50–60 microns |
| Theoretical coverage | 9–10 m²/L per coat (surface-condition dependent) |
| Pot life / surface dry / recoat | 3–4 hours / 2–3 hours / 24 hours |
| Application temperature | Above 10°C, by brush or spray |
| Packing and shelf life | 20 L unit pack; 12 months sealed, stored cool and dry under shed |
Industry use cases
Steel Fabrication Yards
Fabricators shop-prime trusses, columns and platework immediately after blasting, using the 2–3 hour surface-dry time to keep members moving through the yard the same shift.
Chemical & Process Plants
Maintenance teams specify ERO 60 under epoxy topcoats on pipe racks and equipment steel where acid and alkali fumes would soften a conventional alkyd primer within months.
Infrastructure Maintenance
Repainting contractors on gantries, bridges and platform steel blast back to bare metal and re-prime, relying on the wet-plus-dry blasting routine for salt-contaminated members.
Pre-Engineered Buildings & Warehousing
PEB erectors use it for site touch-up and re-priming of damaged shop coats, since brush application bonds cleanly into the surrounding epoxy system.
Utilities & Tank Farms
Tank exteriors, supports and access steel get a barrier primer coat before PU finish coats, keeping the full system within one manufacturer’s chemistry.
Frequently asked questions
Does ShaliPrime ERO 60 need a topcoat?
What surface preparation is required?
How much area will a 20 L pack cover?
How long do I have after mixing, and when can I recoat?
Can it be spray applied?
Is this the right primer for exposed rebar in concrete repair?
How we position STP ShaliPrime ERO 60
Within the STP protective coatings family, ShaliPrime ERO 60 is the workhorse barrier primer; step up to ShaliPrime Zn R (zinc-rich epoxy) or ShaliPrime ZnSl (zinc silicate) where severe or marine exposure demands galvanic protection, and pair ERO 60 with ShaliUrethane PU TC 2K as the UV-resistant finish coat to complete the system in one brand’s chemistry. For buried or immersed steel, STP’s ShaliPrime CT coal tar epoxy is the more appropriate primer. Where the steel in question is exposed reinforcement inside a concrete repair rather than structural steelwork, the Fosroc route — Nitoprime Zincrich Plus or Nitozinc Primer under Renderoc mortars — is the honest specification, and Space Arc supplies and applies both brands.
Fosroc Nitoprime Zincrich Plus — Choose the Fosroc option when the steel being primed is exposed reinforcement within a concrete repair, where a single-component zinc-rich primer giving galvanic protection under Renderoc mortars is specified instead of a barrier primer for structural steel.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.