GESSO PRIMER is a surface preparation material for surfaces art painting or decoupage. It has the ability to close surface pores, making it easier to apply evenly and save colour. With mediums you can alter the drying time, sheen, texture or transparency of your paint, without undermining its structure. Explore a wide selection of paint mediums and varnishes for acrylic paint, oil-paint, watercolor-paint and more. Mediums for painting change the texture of paint and slow down and speed up the drying time. Experiment with a wide variety of effects, including textures, and thick layer applications.