gmat, i have silicone tubing & WW. i was suspicious of an old pinhole leak, but i'm curious as to why silicone has issues with WW?
some guys i used to fly remote controlled airplanes with mixed their own fuel, which included 100% pure methanol in the ingredients. i know most hobby shops don't carry the stuff, but some do & most could tell you where to find it. if you have a friend into drag-racing, he'll also probably know where to buy pure methanol.
creature, i'm not 100% sure if your zinc coating won't react with the copper eventually. IMHO, i'd ditch the alloy T's & go with polymeric T's. ferric-oxide is green (copper corrosion & WW = brown?:\), so it could be water block corrosion. i'd probably flush the system with DI & replace it with fresh WW solution (or methanol), just like doing regular maintinance on an automobile's cooling system.
i prefer silicone tubing because WW contains chemicals & i'm not a chemist by any means. i know tubing silicone is fairly inert, since i use it on my model airplane fuel systems for 18years (with methanol & nitro-methane, & other very active chemicals at very high temperatures). caveat: from my experience, silicone tubing expands a lot if it is exposed to methanol.
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