Yup,

The Avistar wing halves were epoxied with 30 minute epoxie. This was the ARF and not the RTF kit. Only the RTF has the clamped/bolted wing joiner.

I suspect what happened was the weekend before the wing failure, I misjudged the distance away from me and clipped the left wing in a bean field while landing. I suspect that this stressed the joint and started crack initiation.

Purely speculative, but it would explain it.

RiffRaff