Crackle glaze creates the most amazing effects! Simply choose two acrylic paints - one as your base & the other your main paint, through which the base colour will appear in the cracks. Paint the base colour, leave to dry. Paint on the crackle glaze, leave to dry then paint on your top coat of paint & stand back & watch the cracks appear! Water soluble - simply wash your brush in water after use!

See the results here