I bought some Reeves watercolour boards to try put as I hoped that as a board there would be no cockling. The painting "Fill her Up 2" was done on the board and I was very disappointed. I tried to use watercolour in the usual way by applying water before adding a wash. The board instantly soaked up the water and I was unable to apply a wash on to a wet surface. As I progressed through the painting I found that any attempt to paint wet on wet was impossible on this surface. Having left it overnight I found that the board was very very bent. The only to straighten it was to spray the back of the board and flatten it with a weight until dry. I have 4 more of these board but watercolour will not be the chosen medium for them. Thick acrylic or pastel may work. Does anyone else have any experience of using these boards? I be interested to hear.