I just finished a piece on another type of Rtistx panel - RTX 280 Portrait Smooth. I completed the piece shown here with 100% wax-based colored pencils, but I would like to try using neocolor water soluble pastel crayons on this surface as well. Like the RTX 300, this panel is thick and yet surprisingly lightweight. However, RTX 280 has a sanded surface more like Wallis pastel paper. I prefer this support to Wallis because the thickness of the panel prevents warping, and the sanded surface seems a bit finer.