WMC mortgage is heating up its product mix for the summer with a new 100 percent funding program. "We’re hoping to create some fireworks," said Amy Brandt, WMC’s senior vice president and national sales manager of the company’s "Summer Fireworks" program. Available as both a purchase-money and refinance product, WMC’s new offering provides loans of up to $750,000 to borrowers with FICO scores as low as 620. "It definitely blows the ceiling off what you