My toilet was replaced and it has no caulk around the bottom of it. A little water does seep around it from time to time. What kind of caulk should I use to do the job? It sits on ceramic tile, and the tile is on a cement slab.
It is best NOT to caulk this location. Caulking this location can lead to moisture from a leaking toilet getting trapped under the toilet and creating a haven for mold (and/or rot, should there be wood in the area).
In your case remove the toilet, and replace the wax seal (or use one of many rubberized "no wax" products, which claim to be better.
If you do caulk the location, I recommend leaving a gap at some point, perhaps in the back of the toilet, to allow some air circulation. I prefer a quality latex caulk to silicon, as the silicon never seems to stick all that long.
First you need to find out where the water is coming from. Check all around and under your toilet to find the most wet spot. The water may not be coming from under the toilet but just settling there.
If water is coming from under the toilet, you should replace the wax gasket. If you caulk around the base of the toilet without fixing the initial cause of the problem you will be making matters worse for yourself in the long run.
You must first repair the leak coming from the base of the toilet. Most likely the wax ring needs to be replaced. Once the leak is repaired than you can caulk the base.
The type of caulking used prominently by most installers is any good exterior latex or siliconized brand. The reason for latex is it seals very well once cured and also it is easily cleaned from non-target surfaces with a moist rag.
It is best not to use an adhesive-type caulking only because the toilet may need to be moved and gluing it to the floor will only impede its' removal.
Yes you need to find where the leak is if it is your wax ring replace it afterwards roll some plumber's putty very long and put around the bottom of the base of the toilet when you push down the toilet on to the flange and a wax ring the party around the outer of the toilet will squeeze out and make a sale, this would be a better option for you. Silicone caulking witches make a mess and ruin the tile underneath only when you wipe the silicone you would get it everywhere most professional plumbers used plumber putty to make a gasket like around the base of their toilets look around