This white plaster commercial heart arrived kinda smashed up, but I have Apoxie Sculpt, and when you have Apoxie Sculpt nothing is ever broken for long.
I painted it with acrylics, then with interferent blue, then varnished it with many layers of Dura-Clear gloss.
So many layers.
And then varnished it again, so the crystals would be sort of sunk in the gloss. Which worked really well! Just a project to help my spooky heart feel strong in the darkness.