Yes I used the cornstarch receipe, and I don't think the UV light is enough in my case. I got a bit of whiting but not much (it was in the tub for about 10 hours) and it was constantly "wet".

I'll wait for summertime to restart the process. And I did loose some silver paint on the inside. :-/

eta: I would think chemically, (I thought about the plastic wrap idea before) there needs to be frequent reapplication off H202 and Oxi to destabilize the bromide bonds correctly. If we run out of chemical supply, then the chemical reaction could be slowed or halted.