Repair Systems — Concrete & Structural Defects
Rebar primers and corrosion inhibitors
Technical product reference for rebar primers and corrosion protection coatings applied to cleaned reinforcing steel before repair mortar placement — covers zinc-rich, cementitious, and epoxy cement primer types for EN 1504 compliant concrete repair.
Rebar primers and inhibitors in concrete repair and reinforcement corrosion management
Rebar primers are applied directly to cleaned reinforcing steel exposed during concrete repair to provide an immediate corrosion protection layer before repair mortar is placed. They are a mandatory component of EN 1504-compliant repair systems and are specified by remedial engineers for all active repair zones in concrete spalling and reinforcement corrosion repair. The primer passivates the cleaned rebar surface and, in some products, acts as a bonding agent between the concrete and repair mortar.
Product Reference
Individual products — one card each — scroll to view all
Ardex Australia
Ardex BR 10 ZP
Single-part zinc-rich rebar primer — galvanic protection
Ardex BR 10 ZP is a single-part, zinc-rich primer for reinforcing steel that protects galvanically (sacrificial zinc). Apply a continuous film; a second coat may follow once the first is dry (~1 h @20 °C), and the repair mortar / micro-concrete is placed once the primer is dry to touch. CONFIRM dry film thickness, EN 1504-7 status and pack size against the current Ardex Australia TDS.
Fosroc / Parchem
Fosroc Nitoprime Zincrich
Zinc-rich epoxy rebar primer — 50 µm dry film
Fosroc Nitoprime Zincrich is a zinc-rich epoxy-resin primer that protects steel galvanically and as a barrier, applied in one coat at 50 µm dry (120 µm wet) and allowed to dry fully before the repair mortar. CONFIRM EN 1504-7 status, pack size and occupied-space VOC suitability against the current Fosroc / Parchem TDS.
Sika Australia
Sika MonoTop-910 N
Cementitious bonding primer + rebar corrosion protection (EN 1504-7)
Sika MonoTop-910 N is a one-component, polymer-modified cementitious coating with silica fume, used as both a bonding primer and reinforcement corrosion protection, conforming to EN 1504-7. Apply ~2.0 kg of powder per m² per 1 mm layer over at least two layers; the repair mortar is placed while the primer is still wet (wet-on-wet). CONFIRM pack size against the current Sika Australia TDS.
Mapei Australia
Mapei Mapefer 1K
Anti-corrosion cementitious rebar primer with corrosion inhibitor
Mapei Mapefer 1K is a one-component cementitious coating based on polymers in water dispersion, cement and corrosion inhibitors, brushed onto rust-free reinforcement to prevent corrosion. Apply two coats (~2 mm total; ~100 g/m on an 8 mm bar); the second coat 90–120 minutes after the first (preferably within 24 h). CONFIRM EN 1504-7 wording against the current Mapei Australia TDS.
System Comparison
Rebar primers & inhibitors — confirm all selections against the current manufacturer TDS before specifying.
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Do not confuse rebar primers with:
- Migrating corrosion inhibitors (MCI) — MCI products are surface-applied to the concrete and migrate through it; rebar primers are applied directly to physically exposed cleaned rebar — a completely different product class and application
- Concrete bonding agents (SBR latex, acrylic) — concrete bonding agents improve adhesion between old and new concrete layers; rebar primers protect the rebar surface — both may be used in the same repair but they are different products with different functions
- Concrete surface primers (epoxy primer coats) — epoxy surface primers are applied to the concrete substrate as part of some overlay or coating systems; rebar primers are applied to the metal rebar surface only
- General epoxy coatings — industrial epoxy coatings used on structural steel in atmospheric environments are not EN 1504-7 approved and should not be substituted for rebar primers in concrete repair
- CFRP laminating resins — Sikadur-30, Adesilex PG1, and Nitowrap EP are structural adhesives and laminating resins for CFRP strengthening, not rebar primers — their function and chemistry are completely different
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer TDS, project specification, substrate condition, and applicable standards. Do not rely on this reference as a substitute for professional engineering advice.