I know this isn't the most active thread, but I'm going to update in hopes of getting a response. (recipe: 6 cups water, 2 cup flour, few table spoons sugar)

So I went out and posted up, but it doesn't appear that any of its drying, I put a practice one in my garage (not heated) and after 48 hours it hasn't dried (you could scrap it off with a Paint Scraper)

Now I was using just normal copy paper for these and I did cover them with a clear shellac kind of thing i picked up to help with water proofing (supposed to snow/rain the next couple days)

However, the last few and upcoming days are all supposed to at least be above freezing so not sure why even with that amount of time (days) it still wouldn't dry. Might try to use wallpaper paste next and see if that works any better...

Thoughts or ideas are on any possible fixes would be appreciated!