I started by sanding the surface with 60 grit on a orbital sander to rough up the surface and remove most of the old glue. Once that was done I wiped everything down with Xylene, the recommended cleaner form Weldwood. Then I sprayed DAP Weldwood contact adhesive Landou Top and trim. It does require a respirator while working inside the camper but overall it is a pretty easy to use. I bought an $18 HF paint
spray gun with 2mm tip and it worked great. The can said it would cover up to 220 sq/ft and I got just about that done. I still have about 80 sq/ft to insulate and then I have to put the same number of sq/ft of bulkhead carpet up. Before I done I will have used approximately 3 gallons.