With the recent change in the type of silicone used to make Glamerliz practice hands, a pre-gluing Bonding agent or "Primer" is needed if you plan of gluing the nails onto the hand. 
 
CAUTION: This is NOT for human use. It is to be used on your silicone practice hands only. 
Liquid is highly flammable. Can be harmful or fatal is swallowed. Can cause skin irritation. Keep out of reach of children.