Can I add bits of colored glass or stones in the designs to get a different more colorful finish?
Only if you glue them down first. The tapping process to remove air bubbles also moves the rocks up into the concrete, so your glass or stones would disappear along with the concrete gravel. Use some sticky shelf or contact paper (two-sided tape also works), cut it out to fit the molds designs where you want the stones or glass, and then stick the glass or stone to the paper. After your stone has been removed from the mold and dried, then peel off the sticky paper to expose your colored glass. You may have to wash it off gently to remove any concrete residue from the extra pieces. Concrete 101: Concrete is made of sand, gravel, and cement. Cement is the glue that holds the sand and gravel together. The gravel (or aggregrate) is what provides the strength in concrete. Almost all local concrete contains Portland Cement (a specific brand of cement). Mortor mix is just sand and cement. No gravel = no strength. It is generally used just to “glue” things together like bricks and stone. If yo
