I would try to use one of the box drying methods that is described in some of Jorges books. Basically run string across the box and hang it in there. You can keep opening the box to let the humidity out. I dont put anything on my ballast... I guess Im kinda paranoid too but I met this guy once with his dogs tattooed on his forearm and asked him about it. He said his grow burnt his house down killing his dogs.... F'ing not worth it.