Fresco Finish Chalk Acrylic Paints - Opaque's High Coverage/ Opaque Chalk Finish Acrylic Paint. PaperArtsy Fresco Finish Acrylics are top quality, highly pigmented water based, enviromentally friendly acrylic paints. Can be used on many surfaces without the need for undercoat or primer: paper, card, metal, wood, ceramic, canvas etc. The chalk finish is perfect to stamp on. Dilute with water for a wash, or mix with glaze for higher transparency.