Nicholas Babineau, I call it permaseal. I like "bear poop" better. It's used to keep moisture out of connections such as where the defrost heater connects to the thermostat. I've seen temperature sensors wrap and secured to evaporator coils in it. It's used on some compressors to quite the noise. Its applied around the drain opening inside the freezer under the evaporator drain pan as well as where the drain hose attaches to drain under the freezer. I'm not surprised to hear you found a blob of it in the drain. Possibly someone over did it when they attached the drain hose. Usually the drain bill/hose clogs and freezes due to dirty condensor coils . The dirt, heat and moisture will create a sticky, nasty clog. Clip a V in middle edge of bill so water will drip better but the sides will still seal. Clean condensor coils at least once a year, more often if you have pets. Level the refrigerator -3 towards back for proper drainage and to help doors close.