My upper radiator hose is leaking on both ends. The radiator is original and the thermostat housing is from Simmons Autosport's metal housing. The hose (Motorcraft) is about 3 years old and has 35k miles on it. The leak on the thermostat housing occured since I replaced the housing and the hose at the same time; the hose was new and the connection necks were clean. I plan to replace the hose as the leak is getting more than just seepage. Are there suggestion on type of sealant that I can use to help prevent future coolant seepage? I have tightened the hose clamp as far as I dear to go (don't want to crack the radiator's plastic neck) Thanks for the advise!