Window mosaic help

I would like to decorate my laundry room door window. I would like to do the DIY mosaic using the Dollar Tree stones. My question is can this be done in a vertical position? I really can't take the door down so I'm hoping I could do it in an upright position without the stone sliding before the silicone drys. Please tell me i can???icon
No privacy what so ever!!icon
  12 answers