Empennage - Paint
I looked at the white paint, and sure enough, the bottom of the bottle was covered with what looked like white sand. I spent fifteen minutes trying to crush the residue, but it just wouldn't mix anymore. This was the end of the bottle, so it was my last chance. This time I poured the paint through a piece of cloth before mixing it with the hardener. The final result was a lot better than before, but not perfect. I am done with the white paint for now, since I am out. I will have to decide later whether or not this is acceptable.