I used latex gloves, then just had a pile of silicone that i could take a little bit at a time and smear over the great stuff. Once you have a section covered in silicone, I found that its way easier if you just pile the dirt on top of it completely,(like and inch thick at least) then press down really hard and let it sit. If you didnt see any foam through the silicone, it should most likely hold the dirt no problem.
My first mistake was just kinda sprinking the dirt on. This didnt work so well...
