i cannot find my book on floor cloths anywhere, when i had big plans, and after not doing anything and thinking, i remember the book used paint, latex, on canvas, hemmed the edges and used poly urethane to finish it, i just remember thinking, would it crack? i believe there was a mention of varnish,however i know that will discolor, and will take forever to dry (done a boat or two in my time, i found several semi informative articles on hgtv, some reason cannot post link, but it does say something about using water soluable varnish (i still think they mean poly urethane, the stuff in the blue can/did not want to use the name), i have used it on with fabric on drink trays, book covers and such, maybe she could check it out, hope this was helpful
jan in florida
make sure to advise her not to use a boat fabric/again/no name/it will not take a finish, to long to post, but if you e me i will explain