Autentico Crackle Glaze
This crackle system works in between layers of your paint. Shown here in a botttle, but also sometimes comes in a small tin.
1- First paint your piece in the colour that you want to show through the cracks and allow to dry.
2- Paint in an even layer of crackle gaze ( in one direction stroke) If doing a large piece you wouldn't necessarily need to crackle the whole piece. You could just apply in patches). Allow to dry.
3- Paint top contrasting colour, being careful to paint in one direction strokes ONLY when going over the crackle gaze areas. You will see the paint immediately trying to separate and cracks form. This stage can be speeded up with the use of a hairdryer on cool setting, over the crackled areas.