I just replaced the radiator on my WD45 and am unable to get the big hose (the one that comes off the bottom of the radiator) to seal where it hooks up on the water pump. I"m using the same hose that"s been on it for only a couple of years and is still very flexible; I cleaned the water pump off before I put it all back together, and the connection leaked. Took it all apart again, cleaned it off again, put some Permatex #2 on it, slipped the hose back on, tightened the clamp, and it still leaks. Put a second clamp on it and it still leaks. Does anyone have any suggestions on what I can do to stop the leak?