first off, APC products are garbage!! i had the same problem with the first set of altezzas i had on the zx3, the clear plastic that covers the entire light actually fell off when we were driving and i had to get a new set, luckilly i got them replaced for free so on the new ones i used some industrial epoxy that we had at work, and went all around the outside of the lights where the cover meets the back piece before i put them on. that seemed to work, no condensation anymore. so i guess you could try some 5 minute epoxy or maybe even model glue. just make sure you get something thats reccomended for plastic because most glues wont stick because of the high silicone content in molded plastic.