I used high quality paint that will not easily fade. However, if you do want the best protection, you could cover the work with glass. Size is of the art is about 8.5' x 11' give or a take a little bit. I signed and dated the back of the art piece.

http://www.ebay.com/sch/killya_later33/m.html?item=151187097164&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562