OK, just brought home a Hobbico field box that I'm trying to assemble. The instructions call for medium-thick CA glue. The guy at the hobby shop sold me ZAP-A-GAP CA+ to do the job. I apply a liberal line of glue in a seam as per instructions... the bottle of glue said it sets in 10 seconds... I hold it in place for at least 30... boards fall apart. Hmm... I try again, apply even more glue this time and hold for a minute... same results.

What's the story?