Reviews : Vallejo Bottle Retarder Medium Water Based (60ml ) Vallejo Acrylic Paints Bottle Retarder Medium Water Based (60ml ) $4.49 Leave a Rating! ★ ★ ★ ★ ★ OR Write a Review! Write a Review Sort 5-Star: 2 (1 ratings) 4-Star: 0 (1 ratings) 3-Star: 0 (1 ratings) 2-Star: 0 (0 ratings) 1-Star: 0 (0 ratings) Reviews Slows drying By: hdr Like all retarders this slows drying time to help get a smoother surface. (0) Retarder By: irvel20 (Oro Valley, AZ) Great service and the correct item ordered was received. Thank you (17)