Any advice on gl paints?

My mom is trying to paint some gl ornaments for Christmas and got Delta Air Dry PermEnamel Gl Paint. It hasn't turned out very well so far-- the paint is so runny and imprecise it's impossible to write or draw with it, and just smears on the gl. She has been using the surface conditioner and it doesn't seem to help. Does anyone have experience with this paint, and have any tips for us? Or what paint would work better? We don't want to go out a get another brand just to have the same problem. Thanks!