well it is the glue that has not withstood the chemical. I expected it to though
Ferric chloride is nasty stuff. Really nasty. I mean, you might think the blood of those monsters in Aliens was nasty, but that's nothing compared to ferric chloride... (OK, you know where I'm going with this
)
But seriously, I worked with ferric chloride in an industrial etching plant once, and it really was evil stuff. All the joints and valves and pumps in the handling area were made out of solid PTFE, the floors and walls were sealed with chemically resistant cement, and anything that could corrode got corroded.
Yes, you can store it and transport it in plastic bottles or carbuoys, but whatever is holding it should not have seams or joints or anything like that.
Corrosion resistance is generally measured in time for a certain depth of damage to occur. There are many things that will withstand short term exposure, but will not necessarily withstand months of continuous contact. If there is a weak point in your system, it is going to get found given enough time.
Also, I second the above suggestion about using photographic developer trays. That's what I used in the past. Because they are flat you can watch the development of the board take place as the etching proceeds and stop at just the right time. You can stir the solution around with a plastic rod to bring fresh etchant to the board. It only takes a few minutes to complete the etching even at room temperature. When you are done you can pour the solution back into the bottle using a funnel and keep it safe and secure.