To achieve a variety of effects and expressions in your acrylic projects, reach for this quality medium from GOLDEN. This crackle paste is a thick, opaque medium that develops deep fissure-like cracks as it cures. To achieve a variety of effects and expressions in your acrylic projects, reach for this quality medium from GOLDEN. This crackle paste is a thick, opaque medium that develops deep fissure-like cracks as it cures.