I contacted the PPG color library Tim. The number has changed to 1-800-647-6050. Asked for an offset for the Ditzler 31104 listed on the chart. The lady told me that she would have to make up a formula for that and would email it to me. She had to make it up in DBU and from what I understand with out the clearcoat that's DUI. I got the email an hour or so later, a series of numbers, colors and proportions. I called it in to the dealer an hour away then me and the dog drove down to pick up another qt. of DBU/DUI.
The tint looks right in the can, that's all I can say right now. I haven't had a chance to spray any samples yet.
Denny (the nit-picker)Graham
Sandwich, IL