I usually cut my hexies with somewhere closer to a 3/8-inch seam allowance because some of that allowance gets taken up in the fold over the paper, and you end up with more like a scant-quarter inch seam. Sometimes it's even skinnier if you lose a thread or two from the edge when basting.
Here is my progress as of earlier this week when I brought it out of hibernation in my all-EPP-all-the-time obsession this week.
At this point, all of the hexies have been thread basted. But a friend asked me recently if I thought glue basting was a better way to go. Honestly, I hadn't given it much thought for my already-in-progress projects such as this, Over the Rainbow, and Grandmother's Flower Garden. But I've decided to give it a shot. And I really think it may work, especially for this quilt. The other quilts are so far along, that I'm not sure whether I'll change from thread basting on them, but here is a close-up of the glue basting (top) and thread basting (bottom). Not much of a difference in the appearance. But a major difference in the time and amount of work involved in wrangling those scant seam edges while basting!
Stay tuned for updates on how well this works. It's definitely working for my Tula's Bloomers quilt, which I'll be posting about again soon. Let's just say, I'm fixated on English paper piecing at the moment, and can't seem to find the inspiration to work on anything else but these projects right now.