Fresco Finish Drying Retarder is a top quality, non-yellowing, water based, enviro-friendly, acrylic paint additive. This Edit Product is used to slow down the drying time of acrylic paint. When used with Fresco Finish Chalk Acrylic Paint add a drop or 2 to your puddle of paint. No more that 5%.Perfect for using Fresco Finish paints with a Jelly Plate for printing.