Mod Podge or varnish on canvas-covered trunk?
I just acquired a WWII-era (I think) trunk that I intend to use as a coffee table. The exterior is covered in what appears to be painted canvas. The trunk is pretty dirty but I'm hesitant to clean it with soap or cleaning solution due to the canvas. When I vacuumed it with a brush attachment, it made some of the paint on the canvas come off.
Because I intend to use the trunk as a coffee table, I want to make sure it's reasonably clean so I can put my feet up on it. :)
I came up with the idea of using matte Mod Podge (or something similar) on the outside of the trunk to seal the canvas and prevent any more dirt or paint from coming off. Good idea or bad idea? If this is a bad idea, can anyone recommend a better course of action or product?