If you want to laminate a print and mount it on a foamboard, first of all, you will need to laminate the print, then you mount the laminated print onto the foamboard.
Laminate film is important, but since there are too much, go to a shop with a proper rep is a must. Otherwise, you will need to spend a lot on the film and time to find which one is right for you.
Also, I don't do hot lamination, cold lamination is very good these days.
aaron