I used Color matched Raptor Liner on my Dart. I sprayed Epoxy on the bottom and then sprayed the Raptor the next day, which was within the recoat window of my epoxy primer. If yours is outside the recoat window, you may want to go over the primer with a scotch brite pad to give it a little tooth.
I masked off the areas where the leaf spring perches, and other items bolt to, but I did not mask off the trans mount area, which made it more difficult to install due to the thickness, but a little Tap-Tap with the dead blow and it went in place. I stopped my Raptor at the pinch weld at the bottom of the firewall and then masked off the frame rail. You can see the tape line in this picture.
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