I let the one I have leak. I'm not sure what you could use to seal the thread holes without covering up the camo.
I use this.. works great so far.. Take 2 bottles to do the average size blind. Hunter's Specialties Water Repellent Spray - Walmart.com
I watched an episode of Jim shokeys hunting show and he made a mixture of silicone chalking mixed with mineral spirits. I tried it and it makes a pretty thick seal. Sent from my Desire HD using Tapatalk 2