While there are certainly many questions about making glitter ornaments, the most commonly asked pertain to what medium is used for the glitter to stick to.
Multiple options are available from mod podge, Elmer’s glue, floor cleaners, hair spray, pledge, polycrylic and polyurethane.
Although, using too much mod podge can cause it to dry white, while other products are prone to yellowing over time.
Do your homework. Essentially you’re looking to use a medium that dries clear.