Originally Posted by Gaupz
Yeah it's like a mat black paint.
Micro bubbles should go away in a week or so too right? there are a few left in the loop still and it makes a trickling noise when it runs through the pump
I have a radiator that I bought second hand that has a funky smell to it. Not bad, just funky. The smell should go away eventually. If not you could always try some kind of non toxic cleaner, like Simple Green. Just spray a bit into the fins and let it dry. Shouldn't harm the fins or hurt performance at all.
And yes, bubbles will go away over time. I found cycling the pump on and off in couple hour increments helped too. It gives the bubbles time to collect into a larger bubble making it easier to bleed out of the loop.