Carpentry and Woodworking - Feedback needed

My Grandson & I have made numerous rustic birdhouses and feeders using 5/8" cedar fencing board. Obviously they were not kiln dried and are now warping. I'm thinking of two possible solutions for future use. 1) a small bead of gorilla prior to nailing and/or 2) clamping several pieces of fencing board between some 2 x 6 and putting them in the Tenn sun to dry prior to use and hopefully not warp! I'd appreciate your thoughts or other ideas.

Better quality wood is less likely to warp. You might check to see what you could buy from a lumber supplier in the rough sawn category that might better suit your needs for rustic and avoiding the wasted time and frustration of dealing with the warping wood. Drying a bunch in a caul might help keep the warpage down a lot. Some warpage is due to uneven drying.

It might be cheaper and more effective in the long run to buy a sheet of rough sawn reverse board and batten or T1-11 siding
and rip it into useful sizes. You could focus on building bird houses rather than fighting wood problems.

Hope this helps.