paint issue

[KAF1]

Good day to all, I have 5 trucks that i have build between last year May and January of this year. i have not have any look with any of the 3 painter that i sent my cabs to, to paint. The back wall of 2 of my cabs are Styrene as I converted them to day cabs. So, I about to take a shot at paint my own Cabs and had a questions. I saw in one post it was mentioned the use of Duplicolor High Primer, so I went on there website and I found it, but it says for use on metals, wood, and fiberglass. It has not mention anything about using on plastic. I am just wondering if this is the same product. I greatly appreciate any help that you guys can have me. Thank you in advance.
Ken.