Do you use the method the OP mentioned to sterilize it? I ask because I've never sterilized soil before because I'm new to growing (< 2 yrs).
I have tried it before. The only issue I've found is you really need to spread it out after pouring the water on it so that it can dry properly. And let me tell you, this can become cumbersome depending on how much you need to prepare. If not dried properly, the combinaton of heat and moisture makes the remaining concoction very susceptable to a fuzzy and uncitely mold. That said, my method of choice is baking it for 30 - 45 minutes at about 200 deg. You got to be careful though Im told, cause if you get the soil past a certain temp, it can actually release toxins or something like that.