Senegalese (sand table technique learned during my stay in Senegal)

I was pleased to learn sand painting on canvas in Senegal
Projecting sand of different colors with gradients of drawing after coating the canvas with glue made from the sap of baobab. (I made this painting, drawing and painting with sand, the bottom shell is crushed.
arrived in France I tried to do other but a problem with the materials, the glue that is not the same texture, difficult to stain the sand to dry, and pass it to separate the grains and the final result is not as good ... to revise my next trip to Senegal!.