I finally got a mixing station built. I've wanted to build one for so long and finally had time and money to do it. I built one with some cheap water tanks that didn't quite work. Poor planning on my part. Then I build revision two and I'm very happy with it. BUT, one of the tanks has a brown/yellowish stain on the inside directly below the threaded cap. I'm not sure what it is. I tried wiping it away but no luck. I contacted the manufacture and they said it will just wipe away. I'm hoping it's just a "burn" (for lack of a better term) from the spin welding.
So my question is should I be worried about it?
So my question is should I be worried about it?