Im running a res on my system with this dye with no problem but then again i havent gone mental with the sye's

I would say this will leak into any cracks but should have no real effect as its a pure dye compared to any achole based dye that helps ware the res over time.

How ever ill go out and buy some and do the same test as i did with cheap last resort tubing .

Best to be safe than sorry.