I'm starting a collection of Penguin clothbound classic books. I've heard that the foil print on the covers can wear away with handling, which seems to be a big design flaw. The books are mainly titles i have already read and enjoyed, which I am re-buying in a pretty format to look eye catching on my bookshelf. These particular versions aren't going to be read more than once, probably, if at all. But I would love to know if anyone has found a way of protecting the foil print from rubbing away. An archival varnish spray of some description, perhaps? I plan to separate the books on the bookshelf with a sheet of tracing paper, so they don't rub against each other to start with.