Additive in water for Alumi heads?

Im trying some new additive--its similar to Water Wetter , but a couple bucks cheaper. It was $8 i think at Oreilly. It helps cool and lube.cant remember the name but its in a clear bottle and its green.

the car wouldnt go over 180 last week but it was only 75 or so out.
Im going to see how it works during the BRUtal iowa summer .