2K Waterborne Polyurethane Topcoats for Construction Machinery

Construction machinery coatings live a hard life: UV, hydraulic oil, impact and aggressive cleaning. The 2K waterborne PU topcoat is where appearance and durability are decided.

Primer + hardener foundation

A proven base is EP137 + EH3510: fast drying with excellent anti-sagging and putty resistance, sandable within the line’s takt time.

Topcoat selection matrix

• AH235 — high gloss at the best cost-performance ratio; the default for standard lines.
• AH239 — fast dry, excellent flow, good chemical resistance; use when the line runs hot.
• AH252 — best mechanical properties and weathering for premium machines.

For matte or satin finishes, adjust with the hardener ratio rather than flattening pastes first — you will keep chemical resistance intact.