We caulked the holes in the floor, sanded a few rusty spots, and coated the floor and ceiling with Rustoleum primer. Then we painted white inside the entire bus. The insulating paint came from HY-TECH, a NASA researching partner. Unclear about what that really means. ;) But another bus conversion team used it with success, so we will try it. We used the additive for the interior ceiling with a regular white oil based paint and will use their insulating roof paint for the exterior. Also, I wanted to lighten it up and get rid of all the grime, so we painted the dash and interior front panels. It's a whole new bus!
WE ARE READY FOR CONSTRUCTION!
We put the insulating paint on the floor, too. Altogether, it took 2 gallons with insulating beads to do 2 coats on the ceiling and one coat on the floor. It took another 1/2 gallon of regular white to do the front. The front two ceiling panels would just not come out. We left them and painted over them, giving it a nice cabin feel up front. The exposed beams, well, we will play around with how to incorporate them into the design.