We had TONS of problems with the colors on our last vinyl. not only did we have a record breaking number of spraypads but we found out much too late that the figure should've been broken down into 7 seperate sections as opposed to our original 3.
PMS#'s are a tricky thing to calculate when your working on a monitor. the variation from our actual pantone color guide to the monitor to the photoshop eyedropper are staggering to say the least. there is no way that i know how to get the colors perfect and in the end you just have to go with your gut and hope the thing comes back from china looking half decent - and without lead - HA.