Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Our shower has a has sill about 4" above floor level made from a single piece of marble, approximately 60" x 6" x 1". The shower surround runs down the center, and is well-sealed to it, with no evidence of seepage. However, there is a wide run of soft limestone on the outside which is eroding away, leaving a lengthwise crack in the marble; this has been growing increasingly wide and deep over the past few years.

I'd like to clean it out and fill it with something epoxy-like (ideally black to match the dominant color of the marble), but I'm wary that anything that expands during curing might cause further problems with the stone. Are there any materials that are well-suited to this?

marble sill with crack

share|improve this question
If you can upload a picture, it might help assess the situation. – Comintern May 1 '14 at 0:26

You can buy powdered marble dust which is used like a mortar to repair cracks.

share|improve this answer
I see white marble dust on sites catering to sculptors, but haven't seen black yet, other than as a pigment. Assuming I locate black, what would it be mixed with? – TomG May 2 '14 at 2:16

I would use a knife grade epoxy, activator and black dye. Probably have to order these online since stores hardly carry these things. After you are done just give it a light sanding with angle grinder and diamond flap disc.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.