i bought pearl spray for my airbrush gun & it didn't even show up on my pink buttercream cupcakes. did i do something wrong or is it meant for fondant only?

I use SMBC, so I can't airbrush on it. It definitely works best on fondant.

pearl spray is pretty subtle. all it does is give a little bit of a sheen.

i just bought the americolor sheen are those the ones you have used? i havent used mine yet i hope they show