make it glow

Submitted to Product Chat

I have tried on a couple of projects using the glow in the dark paint, so far no luck
 I first spray white. let dry then use glow in dark paint, let dry on sun,no luck.
I have solar lights by it. then removed them
.   I really want it to work, gone through 3 cans so far. Please help.  I want to use dessert cups to place along side yard,  the mushroom is a hide a key, 
thankyou for any help
Rhonda  aka Rmine