Or you can give them the PPG/Ditzler Parchment Interior Color Code 22841 and have it mixed from that, right? You can have it mixed in DIU or DBI. I would suggest an adhesion promotor. All these colors codes are available gentlemen. We used to have "books" with them at the shop. Now all this info is on the internet. I've painted a lot of plastics over the years and if done correctly durability and longevity are sound. It's all in the tech sheets and all those are available too. Read them.