BW8008 Metal Cathodic-Disbonding Polyurea Primer

Product description

BW8008 two-component cathodic-disbonding metal polyurea primer.

Use BW8008 for primer, sealing, pore filling and substrate-preparation work before the protective coating system. Confirm metal surface profile, A/B ratio, pot life, overcoat interval and compatibility with the selected topcoat before ordering.

BW8008 Metal Cathodic-Disbonding Polyurea Primer official product packaging image

What BW8008 delivers for metal primer systems

BW8008 is formulated with polyurea-polyurethane resin and polymer materials to form a dense, tough primer film with wetting, shielding, rust prevention and cathodic-disbonding resistance.

Metal adhesion supportDesigned to greatly increase adhesion between prepared metal substrates and following coating films.
Cathodic disbonding resistanceListed resistance is ≤15 mm under [1.5v, (65±5)°C, 48 h] test conditions.
Dense anticorrosion filmThe dense primer film supports rust prevention, corrosion resistance, waterproofing and moisture resistance.
A/B component controlTwo-component 1:1 by weight formula with mixed material used within 1 hour.
Flexible application methodsBrush, roller, airless spray and air spray are listed for project-specific application planning.
Cost-efficient coverageThe listed theoretical coverage is 0.12 kg/m2 at 50 µm dry film thickness.

Why buyers specify BW8008 for metal primer systems.

Use these core indicators to evaluate BW8008 for prepared metal substrates, temperature cycling, cathodic-disbonding control and salt-exposure anticorrosion work.

11.5 MPaAdhesion / tensile strength (dry metal surface), MPa. Listed as 11.5 MPa or substrate failure.

NormalTemperature variation resistance. Listed as normal after -40 to +180°C for 24 hours.

≤15 mmCathodic disbonding resistance. Listed after [1.5v, (65±5)°C, 48 h] testing.

60 g/LSalt resistance. 60 g/L for 30 days, with no rust, no bubbles and no peeling in the listed result.

Application scope

Typical use areas for BW8008.

Use BW8008 where metal structures need primer adhesion, anticorrosion protection and cathodic-disbonding resistance before the follow-up coating system.

Metal structure primer work

Metal structuresFor anticorrosion primer work on prepared metal structural surfaces.
Stainless steel and aluminumFor primer work on stainless steel and aluminum surfaces after surface preparation review.
Rusty low-treatment surfacesFor low surface treatment coating work where loose rust is removed and the surface is ground to the specified standard.

Protective coating system fit

Primer before topcoatUse for primer, sealing and pore filling before the following protective coating film.
Cathodic-disbonding reviewFor projects where cathodic disbonding resistance is a selection requirement.
Chemical and moisture exposureReview acid, alkali, salt, salt spray, oil, water and moisture resistance data against the service condition.

Product information & technical data

Technical data for BW8008 two-component metal polyurea primer.

Review product information, physical properties, cathodic-disbonding resistance and chemical resistance data for primer-system selection.

Product information

Item	Part A	Part B
Appearance	Light yellow liquid	Color adjustable
Specific gravity (g/cm3)	1.03	1.17
Viscosity (cps) @ 25°C	210	380
Solid content (%)	>65%	>65%
Mix ratio (by weight)	1	1
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 at 50 µm film thickness

Physical properties

Item	Test standard	Result
Adhesion / tensile strength (dry metal surface), MPa	ASTM D-3359	11.5 or substrate failure
Impact resistance (kg.cm)	GB / T 23446-2009	60
Abrasion resistance (750 g / 500 r), mg	GB / T 23446-2009	11
Temperature variation resistance (-40 to +180°C), 24 h	GB / 9278-1988	Normal
Cathodic disbonding resistance [1.5v, (65±5)°C, 48 h]	HG / T 3831-2006	≤15 mm
Density (g/cm3)	GB / T 6750-2007	1.08

Chemical resistance

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

Exposure item	Result
Acid resistance 50%H₂SO₄ or 15%HCl, 30 d	No rust, no bubbles, no peeling
Alkali resistance 50%NaOH, 30 d	No rust, no bubbles, no peeling
Salt resistance 60 g/L, 30 d	No rust, no bubbles, no peeling
Salt spray resistance 1000 h	No rust, no bubbles, no peeling
Oil resistance, 0# diesel and crude oil, 30 d	No rust, no bubbles, no peeling

Application guide

Application conditions, substrate preparation and primer coating guidance.

Confirm temperature, humidity, dew point, substrate preparation, coating method, dry film thickness and recoating interval before applying BW8008.

Application environment & substrate treatment

Condition	Requirement
Environment temperature	-5 to +35°C
Relative humidity	35-85%
Dew point	≥3°C
Metal surface	Recommended sandblast derusting to Sa2.5 according to ISO8501-1 or GB8923
Concrete surface	Strong, dense, flat, clean and dry; repair sanding, shelling, cracks or honeycomb with putty where needed
Wood surface	Clean and dry, without burrs, fragments or loose debris

Application instructions

Guide item	Recommendation
Recommended dry film thickness	30-50 µm
Recoating interval	3-24 h
Suggested painting methods	Brush, roller, air spray or high-pressure airless spray
Low-temperature use	Can be used below -10°C; keep the paint bucket in an air-conditioned room for at least 24 h before low-temperature use
Material handling	Mix the A/B materials accurately and evenly; use up the mixed material within 1 hour
Thinner control	Do not add thinner without supplier guidance; call the manufacturer if viscosity changes with environment or humidity

Application tips

BW8008 is two-component, so A/B materials must be accurately mixed and stirred evenly before application.
Use up the mixed material within 1 hour, and do not pour unused mixed material back into the original pail.
If low-temperature application is planned, keep the paint bucket in an air-conditioned room for at least 24 hours before use.
The factory-adjusted viscosity should not be changed with thinner unless the supplier gives specific guidance.

Curing time, shelf life and packing

Curing time, storage and packing information for project planning.

Use the curing profile, shelf-life data and packing details below to plan coating schedule, warehouse handling and bulk project purchasing.

Product curing time

Note: curing time varies with environmental conditions, especially temperature, relative humidity and film thickness.

Substrate temperature	Surface dry time	Foot traffic	Solid dry time
+10°C	3 h	24 h	7 d
+20°C	2 h	12 h	7 d
+30°C	1 h	8 h	7 d

Shelf life & packing

Item	Details
Package	Part A: 20 kg/bucket; Part B: 20 kg/bucket
Shelf life from manufacturing date	Part A: 12 months; Part B: 12 months, sealed and unopened
Storage temperature	5-35°C
Package requirement	Keep the product package tightly sealed
Storage precaution	Store in a cool, ventilated place, avoid direct sunlight and keep away from heat

Health & safety / integrity declaration

Safety data, handling guidance and application verification.

Product health and safety information

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

Integrity declaration

All technical data in this sheet is based on laboratory tests. Actual testing methods may vary under different circumstances, so project teams should test and verify suitability before full application.

FAQ

FAQ about BW8008 metal cathodic-disbonding polyurea primer.

These answers support metal primer, anticorrosion coating and protective system planning before ordering.

What is BW8008 used for?

BW8008 is used as a two-component metal primer for anticorrosion coating on metal structures, stainless steel, aluminum surfaces and low-surface-treatment rusty metal before the matching protective coating system.

Why is BW8008 used before protective topcoats?

The data sheet describes a dense, tough film with good wetting and shielding performance, strong adhesion to metal substrates, compatibility with following coating films and excellent cathodic disbonding resistance.

How can BW8008 be applied?

The application guide lists brush, roller, airless spray and air spray. The metal surface is generally recommended to be blasted to Sa2.5, or manually cleaned and ground to St2 when blasting is unavailable.

What dry film thickness and recoating interval are recommended?

The data sheet recommends 30-50 micrometers dry film thickness and a 3-24 hour recoating interval. At 20 degrees C, the listed minimum interval is 3 hours and maximum interval is 24 hours.

What chemical resistance data is listed for BW8008?

The data sheet lists 50% H2SO4 or 15% HCl acid resistance, 50% NaOH alkali resistance, 60 g/L salt resistance, 1000 h salt spray resistance and oil resistance, with no rust, no bubbles and no peeling in the listed results.

Does BW8008 require A/B component mixing?

Yes. BW8008 is a two-component primer with a listed A:B weight ratio of 1:1. The mixed material should be used within 1 hour, and unused mixed material should not be poured back into the original pail.

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Request TDS, application guidance or bulk project support.

If you are evaluating BW8008 for metal primer, anticorrosion or cathodic-disbonding resistant coating systems, request the latest technical data sheet, application guidance and project-specific compatibility review before ordering.