11.   Once it is clean, seal the tile with masonry sealer.

12.   Or, remove the shiny coating with chemical paint remover, and apply a masonry sealer that does not shine.

13.   Standard masonry sealers are not a good idea for a chimney because they can trap moisture in the brick.

14.   The Crack Cure and silicone masonry sealer have a better chance of filling the crack because they are liquid.

15.   The sealer to use is a masonry sealer, sold in building supply stores.

16.   This treatment will seal the stone just as the masonry sealer does, but it will darken it.

17.   To make the stone a little more resistant to mildew, apply one thin coat of a masonry sealer.

18.   To prevent this happening again, clean the concrete thoroughly and cover it with two coats of a clear masonry sealer.

19.   Whatever cleans the concrete, you can then seal it with masonry sealer, which will make the concrete resistant to water and stains.