You will find some wonderful resources for artists (especially for pastels and oils) at Donna Aldridge Studios
Here are Donna's thoughts on Art Spectrum Colourfix Papers:
'These papers take a tremendous amount of punishment from artists who like to work their painting heavily or for those experimenting with their imagery or technique, making constant minor or major changes. For artists who paint gently and/or flow directly through the painting process with few changes or "surprises", the paper provides an enduring, trustworthy support that you can count on for consistency time after time. '
Donna has some special tips on removing pastel from textured paper such as Colourfix, and on using Colourfix Primer to repair errors: