Custom Speaker Enclosure

I saw on Horsepower TV a show where this audio guy built a custom enclosure for a speaker.

http://xjtalk.com/images/special/resin.jpg
Okay just noticed this, the can says "fiberglass resin"

http://xjtalk.com/images/special/moldfabricandresin.jpg

In this picture he has stretched something they called "mold fabric" that only stretches one way, and then they are covering it with resin.

http://xjtalk.com/images/special/cutout.jpg

He cuts out the top that he didn't cover with the resin which leaves the custom speaker enclosure.

http://xjtalk.com/images/special/speakers.jpg
You can see the finished speaker enclosures.

I guess what I'd like to know is any particular fiberglass resin, and what is "mold cloth"?