As the title suggests how do you go about this, I do use it fairly often and when going over old oil and changing to water based I do use 123 as a bridging primer ( unless I'm using something like Bedec then I use their primer but the question still relates) . It says on the tin it can be tinted up to 16 ml per litre but the tinting machine ( at Dulux anyway) gives the recipe but not what the measurement are in and it would be a lot more than this per litre in any case. I have just tried...
Tinting Zinsser
Tinting Zinsser