Know the differences between alcohol-based markers (Copic and Prisma) and water-based markers (SU Markers, etc.). They are completely different animals.
Copic and Prismacolor Markers are alcohol based
markers. They are not "water-based" like the SU markers or any other water-based
markers. You cannot blend them with water or the regular SU blender
With the alcohol based markers, the results when coloring on coated
cardstock such as the SU Whisper White or any glossy cardstock is horrible. The
alcohol interacting with the coating for some reason results in a patchy
appearance of the colors. When coloring with alcohol-based markers, regular
white 110 lb cardstock works just fine. You don't need to buy any "fancy" type
of cardstock. You can find 110 lb white cardstock at Walmart or even Target at a
really cheap price.
Using regular cardstock has its disadvantages. The
alcohol-based markers tend to dry quickly on regular cardstock; therefore
blending may be less effective but a colorless blender can be applied to
"re-activate" or wet the area to be colored so blending can be achieved. I heard
that the color may be a little lighter with regular cardstock and there are
specialty papers that work with alcohol based markers with more vibrant results
but my DH already spent big $$$ for the markers, he is not about to cough up the
money to buy me specialty paper.
The advantage of alcohol based markers
compared to water-based markers (SU markers) is that the alcohol dries quickly;
therefore, you retain the color of the marker regardless of how many times you
color over it, making blending the edges of two similar shades possible. The
colors are not compounded meaning when you color over it with the same color it
won't get darker unlike water-based markers like SU markers, streaking occurs
because the colors are compounded with each layer causing it to become darker
each time you go over it with the same color.
With alcohol-based markers,
each layer of color is retained meaning if you color over another color, it
retains the last layer and the color do not blend together allowing you to shade
and highlight without changing the tone or color completely into a different
color. With water-based markers, it's like watercoloring, if you add a different
color, it will mix together resulting in a completely different color, e.g.,
yellow over red will change the color to orange. This does not happen with
alcohol based markers: red remains red, yellow remains yellow.