This 5” dot mandala stone was cast from gypsum and dried for a minimum of 1 week before painting. After the black light reactive mandala-inspired design was hand painted, the entire piece is given 3 coats of matte varnish. I also put some felt on the bottom to reduce the risk of scratches to your surfaces! Since the gypsum cures bottom up, bubbles rise and collect there. But the evidence of these bubbles is only visible from the bottom.