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On a recent trip to the coast, my polarizer got stuck to my 10-stop ND filter, both of which I wanted to use but obviously could not. (I keep all my round filters together, using stack caps, which reduces the volume of the filters. I try to keep the filters loosely screwed together to eliminate sticking.) When I got home, I was preparing to order some plastic filter wrenches, but first decided to try an old home remedy- two rubber bands, which worked well. I think one of the problems in trying to separate two filters is that when we try to grasp the filters, the amount of pressure we use to grasp (to keep the filters from slipping in our fingers) may slightly distort the metal rims, thus increasing friction between the two filters, that in turn makes it even harder to unscrew one from the other. The rubber bands allow one to achieve the necessary grasping friction on the rim without having to grasp as strongly. Whether I am correct or not may be debatable, but at least for me, the rubber bands worked.