Name: Mineral Oil Defoamer MO-400
Brand: Coatingsink
SKU: mineral-oil-defoamer-mo400
Availability: InStock

Question 1

Can MO-400 be used in both alkyd and two-component epoxy coating systems?

Accepted Answer

Yes. MO-400 is compatible with solventborne alkyds, 2K epoxy systems, and alkyd-urethane blends. Its mineral oil and hydrophobic silica formulation is chemically non-reactive and does not interfere with epoxy-amine or isocyanate crosslinking mechanisms when used at 0.1–0.5%.

Question 2

Does MO-400 address microfoam as well as macrofoam?

Accepted Answer

Yes. The hydrophobic silica component destabilizes both macrofoam bubbles and trapped microfoam. This dual action is critical in high-build industrial and anti-corrosion coatings, where retained microfoam causes pinholes and porosity that compromise barrier performance.

Question 3

How does MO-400 compare to silicone defoamers for industrial topcoat systems?

Accepted Answer

Unlike silicone-based defoamers, MO-400 poses minimal risk of inter-coat adhesion failures or fisheyes in multi-layer systems. It is preferred for industrial primers and mid-coats where a silicone-free surface is needed to ensure reliable adhesion of subsequent topcoats or clear coats.

Appearance	Pale yellow liquid
Active Content	100%
Density (25°C)	0.86 g/cm³
Viscosity (25°C)	800–1200 mPa·s
Recommended Dosage	0.1–0.5%

Mineral Oil Defoamer MO-400

Specifications

FAQ

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