I used the spring clamps just a little while ago today. I was fixing a cracked plastic lounge chair with DP100, and had an odd place that no clamps would grab. That's the second use I've ever had for them, but was glad I had them today. A neighbor had left these for trash pickup, but I didn't let the trash guys get them. One had some cracks in it where the armrests meet the seat, but they were easy to fix with the help of the spring clamps. Pam and her Sister had been using them like they were, but fixed now. They aren't cheap ones if you were to spend money for them.