Howdy mikeli,
I'll try to give you a hand here if I can.
First, you have an incredible resource here at Armorama,and you were smart to pose the question.
BUT, you have to be at least a little more specific to get a proper response.
For example, what kind of paint is in the jar? Enamel, Acrylic, Oil, RR laquer based? What colour are we talking about? What type of 'filter' are you trying to paint? What is your base colour?
Give us some of this intel and you might be surprised at the help you get.
Tread.
BTW, I WILL tell you this......we all love pics!!!!! Good on ya mate! :-)