I have a GPU that shows some artifact on screen after mining for two months , after opening the GPU case I noticed some large amount of liquid wet on the chips of the GPU, those liquids are from the thermal pads and after cleaning it off it works normal again, bad thermal pads cause the artifacts.
That liquid that you get from around the thermal pads is normal. It won't cause any damage you can just clean it off. When the liquid is there it doesn't mean the thermal pads are bad.
The only time thermal pads can be bad is maybe if you disassemble and GPU heatsink and they tear and there is a bad surface. Or maybe if the GPU is very very old like >3 years. So its strange that you got a new GPU that started to artifact so quickly, I would of just sent it back for RMA.
The reason it sometimes artifacts is due to the bad surface and the memory or mosfets overheat and causes stability issues, usually under high temps.