good point, and the fix for that, if needed, might be a wide silcone band around the body of the light, as a grip area. But yes, I'd say some of the exterior feels like that kind of texture. I've expreienced what you're talking about and it was related to heat, sweat, and storage in a car or on a window sill. I think. None of which apply to our usage of this light. If the sticky mess results from the chemical composition alone, occurring over time no matter the environmental or usage conditions, then I don't think it will happen with this light.
We have around 6 of these and none of our lights have had any external surface breakdown in their 2-3 yrs of use...mostly as desklamps or tool area lamps. So none of the lights have been held in hand for more than probably 20-30min. And the only thing that has broken is the mini-usb port on just one of the lamps which has a cracked cob glass too both issues becuase it fell while charging. But the light still works via charging the batteries externally.