What is the practical shelf life of Film-Guard? I have a large bottle that is slowly turning a darker brown. At which point does it cease to be effective or possibly even harmful?
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If you leave the bottle somewhere that it gets a bit of sunlight, it's possible that is all you are seeing. Regardless just give it a good shaking. There isn't a specific known shelf life as long as it hasn't been mixed with something else or placed into a different container. -
I have some Film-Guard that has spent the last 7 winters in my storage outbuilding. When I looked at it last time in this past summer, other than being a bit darker that when it was new, it seemed none the worse for wear. Sometime in the next two years (if I live that long that is) I will finally have my new house with screening room built, and will finally see how the prints I last ran in the late 80's have held out with and without FG treatment.
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It is stored at room temperature in a dark cabinet in the original bottle with the trigger spray attached. I also noticed that there has been a little evaporation and the bottle has pulled in a bit. I'll keep on using it, maybe a little more generously applied to the pads. At this rate, it will definitely outlast me!Comment
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