My homemade saga dice started as blank white dice, 24 for less than $10. Printed the custom dice overlays from the Saga message board. After cutting out a strip of the 6 symbols for an individual die, I sprayed the back of each strip with Elmer's spray adhesive.
I found it easier to spray the adhesive on a strip of six, rather than spraying six individual symbols. The longer strip tended to stay put, and the adhesive was more easily distributed. After affixing all six sides and drying, I sprayed a few coats of a satin varnish. I haven't quite achieved a glossy, slick finish but the dice roll and tumble just fine and look pretty cool.