One of my lovely followers left a comment on yesterday's post asking about sealing the pastel that I had used........excellent question and here's my thoughts.
I didn't actually seal them at all as the Portfolio Pastels are oil based, not chalk based and so will not rub off. The best way to describe them is waxy, like wax crayon. They will still feel a little waxy to the touch if you just blend with your finger but this feeling will disappear if blended with water. If you heat them, they will melt but I found this left them with a shiny finish which is OK but not the look I wanted for my matt project.
Hope this helps.