Look at the Raptor directions and it gives you the mixing ratios. I believe it is 2oz of tint per bottle of Raptor but you need to confirm. Also, when you purchase the Raptor it comes in 4 bottles. The Upol rep suggested that you dump all four bottles into a mixing bucket and tint them all at once to get a consistent color. Then pour the tinted liner back into the bottles and add the reducer and spray.
As far as the tint, see Alan's comment. You want to use the base tint with no binder.
Finally, per my previous post, mine came out a little lighter than expected. The Raptor base is white and I mixed it with Candy Apple Red tint. I may end up spraying a top coat over it if needed. That is ok as long as you use a urethane top coat.