Sprayed undercoat surface is powdery
Hello, I am using a Dulux Duramax Undercoat spray cans on a workpiece, prior to applying a topcoat of Dulux Duramax Spray enamel.
I have applied the undercoat as three thin coats, with the can constantly moving fairly quickly, and about 6" from the workpiece. There were no runs.
The air temperature is close to 30 degC today.
The problem is, that after the recommended 2 hours curing time has elapsed after each coat I can run my finger along the workpiece and this white powder is left on my fingers.
I can sand the workpiece back with 800 grit, and it is nice and smooth.
Can anyone please comment on the powder, and also , after sanding smooth, should I proceed with the top coats?