My new studio space

I went to my studio space today and considered how I was going to approach removing a giant mural drawing done in some kind of thick water soluble ink. The theory was first sanding then washing, but halfway through sanding this thing off it became apparent that not only was it going to take forever but I was going to go through a number of expensive sanding heads. I was given a bucket of toxic smelling shellac based sealer/primer and told to paint over it and then follow with white paint.