I use a product call Invisible Trail Glow. You spray it on a tree and it's completely invisible to everyone ,even with an ordinary flashlight. You use a UV flashlight and it glows super bright. It's like your own little secret path. I hunt on county park property and need to Keep my spot from non hunters and hunters There website I believe is invisibletrailglow.com If not just google invisible trail glow . The glow has been there for 3 years now. Hope this helps.