Store them flat too, if you have them on there ends the wood will warp. Only thing I have seen was the wood would dry out and CA glue didn't bond well. I just opened the kit box and would leave the kit on the bathroom counter for a few days so as we showered the wood would take in a bit of moisture from the steam. That would take care of the CA curing problem. It doesn't take a lot of moisture to kick off the CA.