This question was asked to me by a fellow WRX'er:

Ok so I am thinking about building a fiberglass subwoofer enclosure like the one in the attached picture. The problem is I have very little knowledge of fiberglass and the associated epoxy that is used. I am looking for any kind of feedback or experiences that anybody may have. I have found a website that sells all the required material but, I am not sure what and how much to buy.