I'm using a canvas art board for my base but you could use a heavy weight paper, wood, etc. Paint your foundation with the color you want to peek through the cracks. I am using black acrylic paint for this example. It doesn't have to be fine acrylics, just the regular acrylic paints found most anywhere work.
After the paint is completely dry cover the entire surface with a thick coat of Uhu glue...really smear it on. The thicker the glue the bigger the cracks will be so don't be shy.
Now immediately after you add the glue, paint over top with your top coat color of acrylic paint...I'm using a eggnog white - it's really a cream color but that's it's name.
Once you've painted over the glue it's time to wait.... You have to let the paint/glue dry and as it does your crackle will start to appear like magic!
You can sort of see some coming through here but you'll have to wait until tomorrow for the full effect :)
Have a wonderful evening everyone!!
I'm off (no comments) to watch paint dry - LOL!!