So many suggestions… The other thing is that I do not know what does “red, blue black” sealer mean. This is my first timing belt/water pump replacement and Permatex has so many of these sealants.
I bought “The Right Stuff” Black and Permatex High Tack Gasket Sealant.
Now I just learned that Permatex has something called “Water pump and thermostat housing”, an RTV silicone that can be used as gasket maker or dressing.