2003 Durango Overheat problem

I am trying to find out what I can do about a Durango Overheating. Wife ran off into the ditch from an icy road and ruptured a bottom hose. I replaced it and noticed pressure test leak problems. It was cold outside so I followed directions exactly and used Liquid glass metallic sealant. Flushed the system out and ran it with water and drained and then poured back in my antifreeze/water solution. After 2 months, now its summer, the Durango is overheating...first it was only at idle and now I can't go 5 miles down the road without it overheating and I mean really hot pegged on the needle. I have replaced the thermostat, water pump, auxillary fan cooler. Now I am afraid that the radiator is possbily clogged with that liquid glass. Please help if anyone knows how to fix this. Thanks and God Bless!