my laundry tub which is concrete is cracked?

Hi leggygal try Prompt cement or similar [doesn't need sand] ask at the builder merchant for that or equivilent tell them what it's for. I used it on two piece W.C's to cement together. It's water proof and sets under water. I'ts also used in manholes for sealing around the invert pipe at the bottom of the manhole. Good stuff.
rake out along the crack and press the cement well in
but be quick don't mix too much at once it goes of very quick. Of course the builders merchant may suggest something else.

Bob
March 2009