To anyone that is seriously interested in fiberglass, I would highly recommend this book: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=2228&item=4506833049&rd=1 . A lot of it is related to commercial procedures, but it really helps to understand the entire process of what is going on, all the way down to the chemical level. It also has a lot of information on building molds, as the author talks about his short run of fiberglass bodied cars. I spent many nights reading in bed with a highlighter in hand.