68' Floor Pan Question

For the most part the factory undercoating is still in tact, from what I can see. As soon as I get the frame connectors and torque boxes welded in I'm going to refresh the undercoating. Someone gave made a suggestion to me, and it seems like a good idea. They say some guys are using Pickup Truck bed liner as an undercoating. Spray it on, and it last forever. What do you guys think?