This thinner is designed to slow the drying process down when spraying acrylic paints and clears. * Add no more than 10 % to your mix to slow it down and get a higher gloss from your top coat. * Retarder thinner helps to improve wet edge time, flow rate and brushability of two-part polyurethane paints in hot weather. * May be used in conjunction with Polyurethane Spraying thinner.