A marine steel protection system for ship decks, hull splash zones and offshore steel structures exposed to seawater splash, salt spray, humid marine air and outdoor weathering. It forms a primer-supported, seamless spray polyurea barrier over prepared steel surfaces, with an exposed topcoat to support long-term corrosion protection and surface durability.
Metal primer interface + seamless spray polyurea protective membrane + exposed anti-corrosion topcoat
Metal primer interface for prepared marine steel surfaces
Main seamless high-build spray polyurea protective membrane
Exposed polyaspartic topcoat for salt spray, UV and weather protection
The system separates steel primer bonding, main membrane protection and exposed surface durability, helping reduce adhesion failure, corrosion recurrence and weathering risks in marine steel environments.
BW8008 creates a stable primer interface on properly prepared marine steel before the main membrane is sprayed. It helps improve bonding between the steel substrate and the BW3-900 protective membrane, supporting anti-corrosion interface stability around rust-treated areas, welds, steel edges and other detail zones.
BW3-900 forms the main high-build spray polyurea membrane over the BW8008-primed steel surface. This layer helps reduce corrosion and leakage paths caused by seawater splash, salt spray, deck wear, impact, abrasion, weld seams, steel edges, joints and overlaps.
BW0-8028 is applied as the exposed anti-corrosion topcoat over the BW3-900 membrane. It helps improve resistance to UV exposure, salt spray, humid marine air, surface aging, color fading and long-term outdoor weathering.
The system is built through steel surface preparation, BW8008 primer application, BW3-900 spray membrane formation and BW0-8028 exposed topcoat protection.
Clean and inspect the marine steel surface before coating work begins. Remove loose rust, salt contamination, oil, dust, weak old coating and other contaminants, then review weld seams, steel edges, bolt holes, deck details, splash-zone areas, surface profile and dew point margin before primer application.
Apply BW8008 over prepared steel to create the primer interface before the main spray membrane. Control primer coverage, target film thickness and recoat timing so the following BW3-900 membrane is applied over a stable primed surface.
Spray BW3-900 as the main seamless high-build protective membrane over the BW8008-primed steel surface. The membrane should remain continuous across deck areas, hull splash-zone details, weld seams, steel edges, corners, joints, overlaps and other high-risk detail zones.
Apply BW0-8028 over the BW3-900 membrane as the exposed anti-corrosion and weather-resistant topcoat. It helps protect the membrane surface from UV exposure, salt spray, humid marine air, surface aging and long-term outdoor service conditions.
System-relevant values for marine steel protection: metal adhesion, salt spray resistance, cathodic disbonding, high-build membrane durability and exposed topcoat weathering.
| Item | Test standard / reference | Result |
|---|---|---|
| Density g/cm³ | GB / T 6750-2007 | 1.08 |
| Cathodic disbonding | HG / T 3831-2006 | ≤15 mm |
| Solid content | Product Information | >65% / >65% |
| Dry metal adhesion | ASTM D-3359 | 11.5 MPa or substrate broken |
| Temperature variation | GB / T 9278-1988 | -40 to +180°C, 24 h: normal |
| Salt spray resistance | Chemical Resistance | 1000 h, no corrosion, blistering or peeling |
| Acid resistance | Chemical Resistance | 50% H2SO4 or 15% HCl, 30 d: no corrosion, blistering or peeling |
| Oil resistance | Chemical Resistance | 0# diesel and crude oil, 30 d: no corrosion, blistering or peeling |
| Item | Test standard / reference | Result |
|---|---|---|
| Elongation | GB / T 23446-2009 | 482% |
| Tear strength | GB / T 23446-2009 | 85 kN/m |
| Gel time @ 25°C | Product Information | 4-6 s |
| Tensile strength | GB / T 23446-2009 | 22 MPa |
| Steel adhesion | GB / T 23446-2009 | 11.3 MPa |
| Cathodic disbonding | HG / T 3831-2006 | ≤15 mm |
| Abrasion resistance | HG / T 3831-2006 | 4.2 mg |
| Solid content | Product Information | 100% / 100% |
| Impermeability | GB / T 23446-2009 | 0.4 MPa / 2 h, impermeable |
| Salt spray resistance | Chemical Resistance | 2000 h, no corrosion, blistering or peeling |
| Item | Test standard / reference | Result |
|---|---|---|
| Impact strength | GB / T 1732 | 50 kg·cm |
| Pencil hardness | Physical Properties | H |
| Bending test | Physical Properties | ≤1 mm |
| Abrasion resistance | HG / T 3831-2006 | 5 mg |
| Impermeability | Physical Properties | 2.1 MPa |
| Solid content | Product Information | 75% / 90% |
| Accelerated aging | GB / T 14522-1993, 1000 h | Loss of light <1; chalking <1 |
| Salt spray resistance | Chemical Resistance | 3000 h, no corrosion, blistering or peeling |
| Acid / alkali / salt resistance | Chemical Resistance | 40% H2SO4 or 10% HCl, 40% NaOH, 60 g/L salt, 240 h |
The above values are selected from the current product-detail Product Information, Physical Properties and Chemical Resistance tables. Final film thickness and suitability should be confirmed according to substrate condition, service exposure, detail design, project specification and the latest approved technical data sheet.
Before handover, key inspection should focus on steel surface readiness, BW8008 primer condition, BW3-900 membrane continuity and BW0-8028 exposed topcoat quality.
Confirm the prepared steel surface before primer application.
Review primer condition and membrane build before topcoat application.
Check the exposed topcoat surface before service.
Use these checks to judge whether the BW8008 + BW3-900 + BW0-8028 system is suitable before final specification.
For prepared ship deck steel, deck details, bolt holes and wear zones where traffic, standing moisture, impact and abrasion can increase coating stress. Review ship decks before confirming suitability.
For selected hull splash-zone areas exposed to seawater splash, salt spray, humid marine air and repeated wet-dry cycles after project review. Review splash zones before confirming suitability.
For weld seams, steel edges, corners, joints, overlaps and transitions where thin coverage or poor edge preparation may increase coating failure risk.
For offshore steel structures and outdoor marine components exposed to UV, wind, rain, salt deposition and humid marine air. Review UV exposure before confirming suitability.
Do not finalize material consumption from area alone. Confirm steel surface preparation standard, soluble salt control, corrosion grade, service exposure, target DFT, edge detail treatment, inspection standard and maintenance requirements before ordering.
Common questions about using BW8008, BW3-900 and BW0-8028 for marine steel anti-corrosion and salt spray protection.
