I have a quick fix it question. The other day I noticed that the conduit by the air conditioner had cracked right next to the house making it impossible to use tape as a fix it. I don't want water getting into the conduit and wrecking the electrical wiring. Can I use spray foam and fill up the conduit? But, is it water proof enough or could it possibly create a problem down the line should the wiring need replacing? Or, can I goop it up with mastic? What should I use to fix the problem?