You most likely won't like this answer but I'm gonna tell you anways.  DO NOT buy the Circuitwriter.  I made that mistake and I swear I will never make it again.  I tried the first connects, they simply wouldn't take.  Even looking at them under a micro, they looked fine, but the chip WOULD NOT OC.  So I tried again, same results.  Cleaned with "Goo gone" and Isoprohol Alocohol and a lint free satin cloth, reapplied the CircuitWriter 3 more times, and it still didn't work.  So I went to my local electronic store here in Tucson and picked up a CircuitWorks pen.  It worked GREAT.  As for the defogger, I couldn't help with that one...