That sooo understates the issues! Getting the parts aligned and held in place, even using corner clamps is very tricky business.
I have had the parts sort of explode all over more than not and the simple case where locking fingers are not possible manages to shift after the sealant is applied, and then wick in between the acrylic and whatever is holding it.
Then there is the Weld-On itself. I keep the can and needle part separate in metal lidded glass jars tightly closed, and even though the can lid is on tight, when the jar is opened there is a woosh of escaping pressure. if there is any material left in the plastic bottle it will evaporate as well condensing in the bottle and having that same woosh. Left at room temperature and any possibility of escape it would likely evaporate in a day,
I am leaving the sealed bottles in the fridge atm but wondering if they should be in the freezer.