I was going to try that and was advised not to. You spray (or apply) glue to the surface and then sprinkle the flocking on it and HOPE FOR THE BEST (good coverage) because you CAN NOT re-do-it !

I was trying to line a small box with felt, velvet, or satin for a "home comunion" box for the church.
I ended up at Hobby Lobby and found some self adhearing felt that is sold in sheets almost like paper. It comes in ALOT of different colors too! I was able to cut pieces to shape with sissors and trial fit before removing the backing and applying to the surface. WARNING be careful because once applyed, it
WONT come off with out ALOT of work!!! DAMHIKT
Actually it is not as hard as I might make it sound but, it does work and is easier and less messy than the spray flocking. It also holds up well with use, the comunion box is a year old or more and is used often and still looks nice.
Rog