I call painted lines "ice".
Any tire, not just Metz will slide on the painted lines. As for wet pavement some tires are better than others. I don't know about the Metz, I have never ridden on them. The Avons hold very well on wet pavement but not at all on painted lines. Stay safe by staying off the lines. At intersections I don't start my turn until after I know I am clear of the crosswalk lines. Those will ruin your day before you know what's going on.