Water Based Epoxy Primer Paint

Water Based Epoxy Primer Paint for Industrial Metal Protection

Water Based Epoxy Primer Paint from JOSME is a two-component protective coating formulated with water-based polymer epoxy emulsion, water-based amine curing agent, environmental anti-rust pigments and functional additives. The product features VOC content below 50 g/L and pull-off adhesion above 2.5 MPa. It is widely used for anti-corrosion protection of large steel structures, marine facilities, construction machinery and agricultural equipment operating in high-corrosion industrial environments.

What Is This Product

Water Based Epoxy Primer Paint adopts deionized water as the dispersion medium instead of organic solvents, cutting down VOC emissions and eliminating flammable risks in enclosed construction spaces. The product can form stable bonding with metal substrates with certain moisture content, adapting to complex on-site construction conditions.

This two-component system consists of water-dispersible epoxy resin and professional amine curing agent. After uniform mixing and construction, cross-linked molecular films will form on metal surfaces to build dense and stable protective barriers, blocking the penetration of water vapor, salt ions and various corrosive media to the substrate.

Water Based Epoxy Primer Paint Parameters

Key Performance Features

Stable Substrate Adhesion The cross-linked epoxy film can closely bond with polished steel, mechanical equipment and metal structural surfaces. Standard surface treatment up to ST3 or SA2.5 grade ensures stable and lasting adhesion effect.

Stable Mechanical Performance The cured coating reaches standard Shore D hardness, with good impact resistance and abrasion resistance. It reduces surface damage of equipment and steel structures during transportation, installation and daily operation.

Moisture and Salt Spray Resistance The compact film structure resists humid air and high-salinity corrosion. It fits structural protection scenarios under ISO 12944 C4/C5 corrosion grades, such as marine environments, bridge projects and sewage treatment facilities.

Low-VOC and Safe Construction With water as the carrier and VOC content below 50 g/L, the product produces low odor during construction. It eliminates flammable risks of solvent-based coatings and adapts to poorly ventilated and enclosed construction spaces.

Moisture Tolerant Construction Different from traditional solvent-based primers, this product can adapt to substrates with slight moisture volatilization, supporting normal construction progress on damp metal surfaces.

Application Scenarios

This water-based epoxy primer serves as the base protective layer of industrial anti-corrosion coating systems, applicable to various scenarios requiring metal corrosion resistance and surface stability:

Large Steel Structures — Anti-corrosion priming for industrial steel frames, storage tanks and bridge steel structures

Marine & Port Equipment — Metal protection for ships and port facilities exposed to long-term high humidity and salt spray

Construction & Agricultural Machinery — Surface priming protection for mechanical equipment subject to frequent friction and external impact

Wastewater Treatment Facilities — Long-term anti-corrosion protection for metal components in humid and chemically corrosive environments

It can be matched with various intermediate coats and topcoats to form a complete multi-layer anti-corrosion system and provide full-range protection for metal substrates.

Surface Preparation & Application Guide

Surface treatment quality directly affects coating adhesion and service life. Before construction, polish or sandblast the metal surface to ST3 or SA2.5 grade to completely remove rust, floating impurities and surface contaminants.

Mix the two components strictly according to the proportion marked on the product label, and leave it for 10–15 minutes of induction time before construction. Pre-polymerization after induction helps form uniform film and stable chemical resistance.

Construction is prohibited when the ambient temperature is lower than 5°C or relative humidity exceeds 80%. If dilution is required, add a small amount of clean water, with the total water addition controlled within 5%. Spray construction is recommended for large-area steel structures, while roller and brush coating are suitable for local repair and small-area construction.

Quality Control Process

All product batches will undergo multiple professional tests before delivery to ensure stable batch consistency:

Viscosity Test (ASTM D562) — Check construction fluidity to guarantee consistent spraying effect

Drying Time Test (ASTM D5895) — Verify drying and recoat interval to support reasonable project scheduling

Cross-Cut Adhesion Test (ASTM D3359) — Detect bonding firmness between coating and substrate

Salt Spray Resistance Test (ASTM B117) — Verify the barrier protection performance of the coating against corrosive ions

Freeze-Thaw Cycle Test — Inspect emulsion stability under variable temperature conditions

Particle Size Detection — Control particle size distribution to ensure consistent performance of different batches

We retain samples of each production batch to track and stabilize product color, particle size and overall coating performance for all orders.

Customization & Supply Options

JOSME provides flexible Water Based Epoxy Primer Paint and packaging solutions to meet differentiated project demands:

Custom color matching, targeted formula adjustment for special corrosion environments and private-label packaging services are available. Standard products can be delivered within 2–3 working days, while customized formula and color orders take 7–15 working days. All export products adopt reinforced ocean freight packaging to avoid damage during long-distance transportation.

Frequently Asked Questions

Q1: What anti-corrosion advantages does this primer have in harsh environments?

A1: It adopts water-based epoxy resin matched with anti-rust fillers and anti-flash rust additives to form a dense barrier film. The coating can block moisture and salt ion erosion, meeting the heavy-duty anti-corrosion needs of ISO 12944 C4 and C5 grade environments.

Q2: What mechanical protection can the cured coating provide for equipment?

A2: The cured film has stable hardness, impact resistance and abrasion resistance. It reduces surface coating damage caused by friction and external force during equipment transportation and operation, avoiding early metal corrosion problems.

Q3: Why choose water-based epoxy primer as the system base coat?

A3: The product integrates adhesion stability, mechanical properties and corrosion resistance. When matched with conventional intermediate and top coats, it can form a complete anti-corrosion system, adapting to long-term industrial outdoor and indoor service conditions.

Q4: Can the product be constructed on damp metal substrates?

A4: Yes. Different from solvent-based primers with strict moisture restrictions, this product tolerates slight substrate moisture volatilization and can maintain stable bonding performance on damp metal surfaces.

Q5: Why is induction time necessary after mixing?

A5: A 10–15 minute induction period enables pre-reaction between epoxy resin and curing agent. Skipping this step will cause uneven film formation and reduce the chemical and corrosion resistance of the finished coating.

Q6: What are the product storage requirements?

A6: The product has a 12-month shelf life under normal temperature storage. It must be kept away from low-temperature freezing environments, as freezing will damage the internal emulsion structure and affect coating performance.

Contact Us

If you have project technical consultation, sample application, bulk procurement and customized scheme demands for Water Based Epoxy Primer Paint, please reach out to our team via [email protected].