Benjamin Moore HP1550 Concrete & Metal Epoxy Primer – Formerly Corotech V155 | Rust & Masonry Sealer

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1 GALLON KIT (Includes A and B)

Benjamin Moore HP1550 is a clear, low-viscosity, 100% solids, two-component epoxy pre-primer and penetrating sealer for concrete, masonry, rusted steel, galvanized metal, and sound existing coatings. Formerly sold as Corotech V155, HP1550 is designed to penetrate porous or irregular surfaces, reinforce tightly adhered rust, seal surface imperfections, and create a strong foundation for high-performance coating systems.

Penetrating Epoxy Primer for Rusted Metal

HP1550 is especially effective on tightly adhered rust. Its extremely low viscosity allows it to penetrate into the rust profile and migrate into difficult areas such as bolt heads, screws, fasteners, welds, crevices, pinholes, and irregular steel surfaces.

When properly applied, HP1550 helps stabilize tightly adhered rust and seal the surface against continued moisture intrusion. Loose rust, scale, oil, salts, and other contaminants must still be removed before application.

Tie Coat Over Existing Coatings

HP1550 can also be used as a tie coat or barrier coat over tightly adhered existing coatings, including many architectural and alkyd finishes. 

Its 100% solids formula exhibits very little shrinkage as it cures. This helps reduce pulling, wrinkling, curling, or lifting of the existing coating. It can provide a transition layer between a sound architectural coating and a new high-performance epoxy, urethane, or industrial coating system. 

Existing coatings should be cleaned, properly prepared, and tested for adhesion and compatibility before coating the entire surface.

Deep-Penetrating Concrete and Masonry Primer

On concrete, masonry, and concrete block, HP1550 penetrates deeply into porous surfaces and helps reinforce weak or irregular areas. It seals pinholes and surface imperfections while improving the adhesion of subsequent coatings.

HP1550 is an excellent primer beneath:

• Epoxy floor and wall coatings
• Urethane coatings
• Polyaspartic coatings
• Polyurea systems
• High-build industrial coating systems
• Decorative and protective concrete finishes

Clear Finish for Interior Rusted Metal

Because HP1550 is clear, it can be used in certain interior applications to preserve the appearance of naturally rusted steel, metal beams, panels, and architectural metal.

It penetrates and helps stabilize tightly adhered rust while reducing loose, flaking material. A test area is recommended because the coating may darken or change the appearance of the metal.

HP1550 is not UV-stable and should not be left exposed to direct sunlight. Exterior applications must be protected with a suitable UV-resistant finish coat, such as an aliphatic urethane.

Key Features: 

• Formerly Corotech V155
• Clear, low-viscosity penetrating epoxy primer
• Two-component, 100% solids formula
• Penetrates and reinforces tightly adhered rust
• Migrates into welds, bolt heads, fasteners, crevices, and pinholes
• Helps protect properly prepared steel from continued corrosion
• Excellent primer for concrete, masonry, and concrete block
• Promotes adhesion beneath epoxies, urethanes, polyaspartics, and polyureas
• Works as a tie coat or barrier coat over compatible existing coatings
• Minimal shrinkage helps reduce pulling or lifting of sound existing coatings
• Seals porous surfaces, loose edges, pinholes, and surface imperfections
• Clear appearance allows the substrate to remain visible
• Pre-measured two-component kit eliminates field measuring

Ideal Applications:

• Tightly rusted structural steel
• Steel beams, columns, railings, and metal panels
• Welded steel assemblies and difficult-to-reach metal surfaces
• White-rusted galvanized metal
• Industrial tanks, machinery, and equipment
• Bare or previously coated concrete
• Concrete floors, walls, and masonry block
• Interior decorative rusted metal
• Tie coats between architectural and industrial coating systems
• Primers beneath high-performance floor and wall coatings

Recommended Exterior Corrosion-Protection System

For demanding exterior metal applications, HP1550 can be used as the penetrating first coat in a three-coat corrosion-control system:

1. Benjamin Moore HP1550 — penetrating epoxy pre-primer that reinforces tightly adhered rust and reaches irregular areas.
2. Benjamin Moore HP4600 Epoxy Mastic — high-build intermediate coat providing additional barrier protection and corrosion resistance.
3. Benjamin Moore HP5000 Urethane — durable, UV-resistant finish coat for exterior exposure, weather resistance, and color retention.

This is an excellent system for long-term protection of exterior structural steel and industrial metal. Actual service life depends on surface preparation, coating thickness, environmental exposure, application conditions, and maintenance.

Recommended For: Interior and exterior concrete, masonry, reinforced steel, tightly rusted steel, white-rusted galvanized metal, and compatible previously coated surfaces.

Important Application Notes:

HP1550 is a penetrating pre-primer and is not a substitute for proper surface preparation. Remove loose rust, mill scale, failing coatings, grease, oil, soluble salts, dust, and other contaminants before application.

COVERAGE:

• Steel: 800 – 1200 sq.ft.
• Masonry: 500 – 800 sq.ft.
• Previously Coated: 1200 – 1600 sq.ft.

Dry Times: @ 77 °F – To Touch 12 Hours, To Recoat 12 Hrs. – Max: 3 Days

• Service Time: Light Industrial Use: 72 Hours Moderate to Heavy Industrial Use: 5-7 days Full Cure: Approximately 7 Days *If topcoat is not applied within 72 hours abrade the surface to ensure proper inter-coat adhesion. Maximum abrasion and chemical resistance are achieved at full cure; care should be taken to prevent damage to the coating during the curing process. High humidity and cool temperatures will result in longer dry, recoat and cure times.

POT LIFE: @ 77 °F - 3 – 4 Hours

INDUCTION TIME: 30 Minutes

Surface Preparation: Surfaces must be clean, dry and free of all grease, dirt, dust, oil and wax. Clean all surfaces using HP6000 Oil & Grease Emulsifier. Remove all remaining loose paint, rust and mill scale via Hand Tool Cleaning (SSPC-SP 2) or Power Tool cleaning (SSPC-SP 3). Fill holes and cracks and sand smooth. Glossy surfaces must be fully deglossed. Moderate to heavily rusted areas must be thoroughly prepared and active rust should be properly removed. All masonry surfaces must be allowed to cure a minimum of 30 days before painting. Acid etch or mechanically abrade all slick, glazed concrete or concrete with laitance. For acid etching, follow ASTM D4260 and manufacturer’s directions and safety instructions. Follow ASTM D4259 for creating a surface profile by abrasion. Rinse thoroughly and allow to dry.

Previously Painted Surfaces: Clean using HP6000 Oil & Grease Emulsifier or solvent washed as outlined above. Dull glossy surfaces by sanding. Remove all loose, flaking or peeling paint prior to application.

MIXING INSTRUCTIONS: This is a two-component product and is preproportioned for error free mixing. Mix “A” & “B” separately.

1. Carefully empty the entire contents of HP1550.90 (Part B) into the can of HP1550.00 (Part A), scraping the sides of both parts to ensure all liquid has been added.
2. Using a drill mixer at low speed, blend this mixture for three to five minutes until completely blended. Keep the mixing blade turning at a slow speed to minimize whipping air into material. Scrape sides of pail during the mixing process.
3. Allow to induct for 30 minutes at 77 °F (25 °C) to application.

Do not thin this product – it is ready to use once both components are thoroughly mixed. It is extremely important to remember that Epoxy Coatings have a limited pot life; therefore, it is wise to make sure sufficient manpower and correct application tools are in order prior to starting the mixing sequence. Estimated pot life is: 3 – 4 Hrs.

APPLICATION:

• Airless Spray: Apply with .009 tip and low pressure (just enough to atomize the product).
• Air Spray (Preferred for appearance and film build): To minimize over spray, use low air pressure and a pot pressure of 5-10 PSI.
• Brush: Natural Bristle only Roller: Industrial Cover with Phenolic corewith a ¼” nap.
• Must be top-coated within 72 hours of being tack free.
• NOTE: Do not allow material to remain in hoses, gun or spray equipment. Thoroughly flush all equipment with HP7040. Do not thin. Where non-skid characteristics are desired, hand broadcast an appropriate anti-slip aggregate into the wet film then back-roll to encapsulate. HP6300 works well for opaque finishes although will be noticeable in clear finishes.

NOTE ON SPREAD RATE: Theoretical coverage at 1 mil dry is 1604 square feet per gallon; however, practical application is expected to be 600-800 square feet per gallon. Actual spread rate will vary based upon numerous factors, including texture of the substrate, application method, waste and surface porosity. The Theoretical Spread rate listed on this document has not taken into account these factors and is only based upon the volume solids of this product and the recommended wet film thickness when applied to a smooth substrate.

LIMITATIONS: 

• Do not apply if material, substrate or ambient temperature is below 50 °F (10 °C) or greater than 90 °F (32 °C). Relative humidity should be below 90%.
• Do not apply if within 5 degrees of dew point or if rain is expected.