Just received two radiators from EKWB, a PE-240, and a SE-120. Planning out my loop I opened up one of the radiator caps to see a weird white/gray concrete like substance around the threads. Might I add, I found it strange how the quality on the PE radiator and the SE radiator differed so dramatically. Strange that radiator which only differ in size would have different construction, painting, etc...
Does anybody have any experience with this? It looks like some kind of corrosion but I'm not expert in liquid cooling so I'm looking for anybody with knowledge on this topic.
Thanks!