I've used Songs as well. Had the windshield done as well with the clear ceramic. Makes whole lot of difference with temps running in the 80s / 90s now.
E60 M5 Silverstone, Balloon White Gallardo Spider, Rosso Corsa F430, Audi CG Q7 Sportline, IS R8 before and DG R8 now, Basalt Black Carrera GT, SG M3 DCT, Orange GT3RS, IS CLK63 Black Series
On order: 2010 R8 V10