Edge guilding helps protect the paper because it acts as a barrier. This applies to books and art on the walls equally. So don't expose your books and artwork to too much intense direct light. You should still be able to enjoy them though. Paper can be deacidified, both aqueously as well as non aqueosly.
Washing also helps strengthen the paper.
Non-aqueous deacidification can be sprayed onto the pages adding the buffer to the papre, but it DOES NOT strengthen the paper or remove any of the degradation products, nor improve the appearance of the paper. It too is expensive.