OK, I'll just go with bare wood. the way they gobble this stuff up I rather doubt it will stay filled long enough either. I was just worried about moisture soaking into the wood, possible leading it to get moldy.Here's a pic of my current one when I built it.... the bar on the top is to prevent birds standing in the trough, dominating the food, and to help me when I move it...it's the largest trough I've made, so it's a little bulky and heavy for me to move around if needed...the handle on it really helps with this. I'll never make another trough without one of these...and, no, it doesn't cause my birds to roost on it and poop in the trough as all my birds are too busy outdoors doing other things. Now, if such a trough were in a coop and run situation, then birds may roost on that as a place to be. This one is 5 or so ft. long...can't remember now but it looks in that area of length.
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Re: your handle idea, yeah, I have something similar incorporated into my present trough, which is now too small, and found it also makes filling easier too as I can lift the entire trough and hold it while I pour in the goop without having to compete with a bunch of food-crazed chickens! I took it one step further though and made mine so the chickens couldn't stand on the handle either, and possibly poop in their feed. Chickens, I found, will do their thing where ever and when ever, regardless of the consequences!

The 'roof' over the trough is slanted so they cannot stand on it's flat surface without sliding off,and it's also hinged so if they try and roost on the upper edge they get dumped! I have seen this idea working in action, which is mildly amusing, if rather slapstick, so I know it works. More to the point though after weeks of use it is still poop free.