yes i have had luck with them and it works good. just make sure and get the real stuff. not the knock off black paint with sand in it. a dented bed floor is always better than a rusted holey bed floor. just dont do this to it. i seen this at a stop light the other day. i couldnt help but snap a picture of it. i wonder what he carries on it.
and yes it is welded directly to the roof. i wonder if he hauls a john boat and has no back glass so he has a place for the motor to go. haha
-justin