David,
There is far more things involved in cracked finishes than mentioned above, but in the OP's case above, it does seem that the cause is probably older Stick Fast.
Back in 2008 - 2009, a then active pen turner showed a cracked finish and even wood. In his case, it wasn't green wood per se, but that fact that his pens were by a window and the sun showed through for an hour a day. That is all it took.
In other cases, there have been wood blanks that were within 5% to 8% moisture when sold. In open shops where humidity changes for 30% to 75%, the blanks, UNLESS Stabilized, will equalize the humidity inside to 12% or more, which that in itself will cause expansion and contraction enough to cause cracking. In fact that could be contributing to the OP's problem to some extent.
CA's differ from kind to kind as Dave Lange (egnald) mentioned here: "I use the product labeled as "CA Wood Finish Thin" and not their product labeled as just "CA Thin"." A few CA's advertise flexibility, and different amounts of INFlexibleness probably contribute to more of the cracking during humidity swings or "in the direct sunlight for an hour or two" that we probably give credit to.