Updated from 1:47 p.m. ETGeorgia Gulf ( GGC), a maker of chlorovinyl products used in building and home improvement products, saw its shares soar 38 cents, or 29% to $1.68 Wednesday after an analyst upgrade. BB&T Capital Markets upgraded the Atlanta-based company from underweight to hold. More than 2.3 million shares traded on Wednesday. On Tuesday, the company announced that it has entered into an amendment to its senior secured credit facility to reset covenants until March 2010 with its lenders and that it has increased and extended its accounts receivable securitization until March 2011. "This amendment provides additional flexibility to improve our capital structure and strengthens Georgia Gulf's position in these challenging economic conditions," said Paul Carrico, president and CEO of Georgia Gulf.