I recently removed vinyl wallpaper from old plaster walls and the glue residue gives a nice faux/Venetian plaster finish that I don’t want to disturb. I want to leave it like it is and feel I should seal the wall to keep it from gathering moisture or crumbling. The plaster is in pretty good shape. There’s a few cracks but not very many. Can I use a clear coat sealer of some sort on it?