The smooth absorbent surface lends itself to use with a variety of mediums. They have been used with many mediums including oil, acrylic, ink, pencil, watercolour, gouache, encaustic paint, paintstick and many others. Made with acrylic gesso these ultra-smooth boards are very absorbent and you may wish to use extra oil in your oil paint. They will accept your paint beautifully and provide a delightfully smooth brushing surface For Egg Tempera work they may not be absorbent enough which usually needs traditional gesso (homemade with rabbit skin glue and whiting). If the surface isn't absorbent enough the egg tempera paint may lift off the first layer when you apply a second glaze. We would recommend adding another 2 coats of traditional gesso and you would have a perfect surface.