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^Hey Boss, I can't tell you how many times I wanted to recoat/seal mine with something. Its just very difficult to decide what to do it with not knowing the detail of the problem in a factual chemical sense. You always have to wonder about combining effects of anything you might apply with the existing problem which may form even more deadly problems for your plants, or you. I've wiped it down with some weird shit including lemon juice thinking maybe a citric acid bath would leach something out, just ended up with a sweet smelling mess as far as I can tell. You also then have to test with live plants which is both time consuming and painful. Don't know if sealing the whole interior with clear plastic wrap or something would make a difference, but here we go down the road of 'maybe, maybe not'. Like you said, its just easier to return if an option, buy another OEM, or make your own whatever size you want.
It is very insidious in that your plants may be in there a week or two doing fine, then start yellowing at leaf tips looking much like a nute burn. If you pull them out right then and remove from influence, they will generally recover in another 7-10 days of fresh air. So whatever it is slowly leaches in, and slowly vents out. I lost 6 out of 10 just trying to figure what the hell was going on as like most, I thought it was a feed problem. Don't walk, run! To many other options for the same $.