Did you spray it on lichen that was in place on your layout ?I used glycerin and water 50/50 and a little added food coloring with good results
But I don't shop at Walmart.....LOL Seriously, I was able to get a good amount of lichen on Evilbay.a large bag of prepared lichen is only a couple of bucks at Walmart ... it needs running through a meant grinder to shorten it up for ground cover purposes .. it's already sprayed and soaked to give it a long life