BW PolyureaProtective CoatingsContact

Two-Component Cathodic Disbonding Polyurea Metal Primer

BW8008

Two-component polyurea-polyurethane metal anti-corrosion primer for prepared steel, stainless steel, aluminum and low-treatment rusty metal substrates. It provides adhesion support, dense shielding and cathodic disbonding resistance before compatible protective coatings.

View Technical DataRequest TDS & Quote
Red primer layer on a corrugated steel roof surface

Product Description

BW8008 two-component cathodic disbonding polyurea metal primer is formulated with polyurea-polyurethane resin and polymers as the main materials, refined through a special formula and scientific production process. The coating film is dense and tough, with high infiltration and shielding performance, excellent cathodic disbondment resistance, as well as rust-proof, anti-corrosion and waterproof properties. It exhibits high adhesive strength with metal substrates and is compatible with subsequent coating films.

BW8008 two-component cathodic disbonding metal primer official product packaging image

Application Scope

BW8008 is used as an anticorrosion coating primer for metal structures, stainless steel and aluminum surfaces, including low-surface-treatment rusty metal structure review.

  • Metal StructuresPrimer review for prepared metal structures before compatible protective coating films.
  • Stainless Steel and AluminumSurface preparation, compatibility and adhesion testing should be confirmed before full application.
  • Rusty Metal ReviewLow-surface-treatment rusty metal work requires removal of loose rust and preparation to the listed standard.
  • Following CoatingsUse BW8008 only with compatible coating films and within the listed recoating interval.

Designed to Support Metal Adhesion and Cathodic-Disbonding Resistance

BW8008 helps applicators build a dense primer interface on prepared metal substrates before compatible protective coatings, supporting adhesion, shielding and corrosion-protection review.

≤15 mmCathodic Disbonding ResistanceProvides a listed value for cathodic-disbonding review under the stated voltage, temperature and 48-hour test conditions.
11.5 MPaAdhesive StrengthThe approved data lists 11.5 MPa or substrate broken for dry metal surface testing.
-40 to +180°CTemperature Variation ResistanceThe listed 24 h temperature-variation test result is normal under the stated condition.
30 dAcid ResistanceLists no corrosion, blistering or peeling under the stated acid-resistance test condition.

Product Features and Advantages

BW8008 is designed for metal primer interface protection, combining strong metal adhesion, dense shielding, rust-control support and cathodic-disbonding resistance before compatible protective coating films.

Metal Primer Interface

  • Metal Adhesion SupportDesigned to increase adhesive strength between prepared metal substrates and compatible following coatings.
  • Dense Tough FilmForms a dense, tough primer film with shielding performance on prepared metal.
  • Cathodic-Disbonding ResistanceSupports review for metal structures where cathodic-disbonding resistance is part of the coating route.
  • Waterproof Moisture ResistanceThe technical sheet lists waterproof and moisture-resistance properties.

Corrosion and System Compatibility

  • Rust and Corrosion ProtectionHelps reduce rust and corrosion risk as part of a compatible protective coating system.
  • Temperature-Variation StabilityThe technical sheet lists stable resistance to temperature change.
  • Following-Coat CompatibilityDesigned for compatibility with subsequent coating films after surface and recoat-window review.
  • Coverage PlanningThe listed theoretical coverage helps estimate primer use at 50 micrometers film thickness.

Technical Data

These technical values are measured under controlled laboratory conditions to support product comparison, project selection and specification review. Please confirm final requirements with the latest approved TDS and project-specific conditions.

Product Information

BW8008 product information
ItemPart APart B
AppearanceLight yellow liquidColor adjustable
Specific gravity (g/cm³)1.031.17
Viscosity (cps) @ 25°C210380
Solid content (%)>65%>65%
Mix ratio (by weight)11
Surface dry time (h)1-3 h
Recoating interval (h)Min 3 h; max 24 h (20°C)
Theoretical coverage (DFT)0.12 kg/m² film thickness 50 µm

Physical Properties

BW8008 physical properties
ItemTest standardResult
Adhesive strength (dry metal surface) MPaASTM D-335911.5 or substrate broken
Impact resistance (kg.cm)GB/T 23446-200960
Abrasion resistance (750 g / 500 r) mgGB/T 23446-200911
Temperature variation resistance (-40 to +180°C) 24 hGB/9278-1988Normal
Cathodic disbonding resistance [1.5v, (65±5)°C, 48 h]HG/T 3831-2006≤15 mm
Density g/cm³GB/T 6750-20071.08

Chemical Resistance

For reference: pay attention to the influence of ventilation, splash and spillage. Independent immersion testing is recommended if other specific data is required.

BW8008 chemical resistance data
Exposure itemResult
Acid resistance 50% H2SO4 or 15% HCl, 30 dNo corrosion, no blistering, no peeling
Alkali resistance 50% NaOH, 30 dNo corrosion, no blistering, no peeling
Salt resistance 60 g/L, 30 dNo corrosion, no blistering, no peeling
Salt spray resistance 1000 hNo corrosion, no blistering, no peeling
Oil resistance 0# diesel, crude oil, 30 dNo corrosion, no blistering, no peeling

Application Environment and Guide

Stable metal primer performance depends on surface preparation, site conditions, accurate A/B mixing and recoat scheduling. Review the application environment and guide values before installation, and confirm final parameters with the latest TDS and project requirements.

Application Environment

BW8008 application environment
ConditionRequirement
Environment temperature-5°C to +35°C
Relative humidity35-85% RH
Dew point≥3°C
Metal surface preparationBlast to Sa2.5 according to ISO8501-1 or GB8923 where possible
Manual rust removalIf blasting is unavailable, remove loose rust and grind to St2
Material mixingEnsure accurate ratio and uniform mixing before application

Application Guide

BW8008 application guide
Guide itemRecommendation
Recommended dry film thickness30-50 µm
Theoretical coverage reference0.12 kg/m² at 50 µm
Recoating interval time3-24 h at 20°C
Recommended coating methodBrush, roller, airless spray or air spray
Mixed-material handlingUse mixed material within 1 hour
Dilution controlDo not add thinner without manufacturer guidance

Application Note

  • Metal structures should generally be sand-blasted to Sa2.5 according to ISO8501-1 or GB8923.
  • If no blasting machine is available, clean loose rust and grind the surface with a wire wheel or sandpaper to St2 according to ISO8501-1 or GB8923.
  • This product can be applied at -10°C. For very low-temperature application, keep material drums in an air-conditioned room for more than 24 h.
  • Agitate the coating uniformly before application and use up mixed material within 1 hour. Do not pour remaining liquid back into the original bucket.
  • The product viscosity is set at the factory. Do not add thinner without manufacturer guidance.

Product Curing Time, Shelf Life and Packing

Use the listed curing profile, shelf life, packing and storage requirements for application scheduling, warehouse handling and order planning.

Product Curing Time

The curing time varies with the environment condition, especially temperature and relative humidity.

BW8008 curing time
Substrate temperatureSurface dry timeFoot trafficSolid cure time
+10°C3 h24 h7 d
+20°C2 h12 h7 d
+30°C1 h8 h7 d

Shelf Life & Packing

BW8008 shelf life and packing
ItemDetails
Storage temperature5°C-35°C
Shelf life from date of productionPart A: 10 months; Part B: 10 months, sealed condition
PackingPart A: 20 kg/bucket; Part B: 20 kg/bucket
Storage precautionStore in a cool, ventilated place, avoid direct sunshine and keep away from heat
Package requirementKeep the product package tightly sealed

Product Health and Safety Information

Product Health and Safety Information

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet containing physical, ecological, toxicological and other safety-related data.

Integrity Declaration

Colorful Whale Advanced Materials (Shanghai) Co., Ltd. guarantees that the technical data stated in this sheet is based on laboratory tests. Actual testing methods may vary due to different circumstances. Users should test and verify applicability. Colorful Whale Advanced Materials (Shanghai) Co., Ltd. does not take any other responsibility except product quality and reserves the right to modify the listed data without prior notice.

BW8008 Frequently Asked Questions

Review the main substrate, surface preparation, cathodic-disbonding, recoating and document questions before specifying or ordering BW8008.

BW8008 is a two-component cathodic-disbonding resistant polyurea metal primer for prepared metal substrates before compatible follow-up coating films.

BW8008 is a primer layer. It should be reviewed as part of a coating system before compatible protective coatings, not as the only exposed metal protection layer.

The technical sheet lists metal structures, stainless steel, aluminum surfaces and low-surface-treatment rusty metal structures. Final use still requires surface preparation and adhesion confirmation.

Metal structures should generally be sand-blasted to Sa2.5 according to ISO8501-1 or GB8923. If blasting is unavailable, clean loose rust and grind the surface to St2 according to the same standards.

The listed cathodic-disbonding resistance is <=15 mm under [1.5v, (65±5)°C, 48 h] laboratory conditions and should be reviewed with the full coating system and service exposure.

The technical sheet lists theoretical coverage of 0.12 kg/m² at 50 micrometers film thickness and a recoating interval of minimum 3 h and maximum 24 h at 20°C.

Buyers can request the latest TDS, SDS, packing information, cathodic-disbonding data and project-specific metal primer guidance before ordering.

Previous ProductBW8007View productProduct categoriesAll productsView categoryNext ProductBW8009View product

Request BW8008 Technical Documents or a Quotation

Share the metal substrate, surface preparation level, following coating, project area, exposure conditions and preferred application method. We can provide available BW8008 technical documents, packing information, quotation support and metal-primer guidance.

By submitting this form, you agree that BW Polyurea may use the information provided to review and respond to this inquiry in accordance with our Privacy Policy. Website use is also subject to our Terms of Use.