What's your time for water bottles?

[MadHatterGraphix 1,258]

Lately I have been having issues with the aluminum water bottles. Blacks are going brown which I figure over heating I know it's. It the ink I have had success with printing other items with the black I have. I'm going 400 degrees 12 min I know it sounds high so what are you using? I'm using an oven.

[redfish 1]

I run mine through a hix oven 390 degrees 4 min, they tend to burn easy as the aluminum is thin and heats quickly.