Solving Sagging and Pinholes in Water-Based Auto Baking Paint

Water-based automotive baking paint faces sagging and pinhole defects during high-temperature curing (140-160°C) due to rapid water evaporation. A East China auto parts plant reported 18% pinhole occurrence on hoods, with rework costs consuming 15% of total coating expenses.

Chemi Tech's leveling agent KMP-229 employs three core technologies:

Dynamic tension control: Polar anchoring groups reduce substrate tension below 22mN/m for rapid spreading;

Thermal resistance: Withstands 180°C to prevent molecular degradation;

Microbubble suppression: Embedded defoaming segments block pinhole formation during baking.

Case: Auto Parts Plant Efficiency Breakthrough

Supplying door panels to German OEMs, this plant eliminated weld-seam pinholes and sagging after adopting  KMP-229:

Process: 0.3% dosage in base coat, premixed with resin and aged 30 mins;

Results:

DOI increased from 85 to 93 with uniform gloss;

Pinholes reduced from 18% to 2%, sagging areas decreased 90%;

Baking time shortened 8%, boosting output 22%.

Now applied to EV battery case coating, solving wetting failures on aluminum alloy.