Name: Anti-Corrosion Primer Resin CR-50 (Alkyd-Phenolic Blend)
Brand: Coatingsink
SKU: anti-corrosion-primer-resin-cr50
Availability: InStock

Question 1

What are the performance benefits of blending phenolic resin into an alkyd anti-corrosion primer?

Accepted Answer

Phenolic resins (particularly oil-soluble resols) crosslink with alkyd during baking or accelerated oxidative cure, significantly improving chemical resistance, water resistance and hardness compared to plain alkyd. In anti-corrosion primer formulations, the phenolic component also improves adhesion to rusty or marginally prepared surfaces and increases resistance to aggressive salt spray and acid condensate — properties critical for maintenance primers on industrial steel.

Question 2

Can CR-50-based primers be topcoated with water-based or two-component polyurethane topcoats?

Accepted Answer

Yes, after full through-dry (minimum 24 h at 20°C), CR-50-based alkyd-phenolic primers can be overcoated with aliphatic 2K PU or waterborne topcoats. However, ensure the primer is fully dry and free of solvent entrapment before applying solvent-sensitive topcoats. For waterborne topcoats, a tie-coat or barrier primer is recommended in critical service environments to prevent any residual solvents from affecting adhesion or film integrity.

Solvent	aromatic hydrocarbon
Acid Value	≤15 mgKOH/g
Non-volatile	50±2%
Viscosity (25°C)	2–5 Pa·s
Drying Time (through, 25µm DFT)	4–6 h

Anti-Corrosion Primer Resin CR-50 (Alkyd-Phenolic Blend)

Specifications

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