If you are pouring lawn ornament molds, you may learn that one mold may require you to leave out the aggregate from the mix and add more sand, another may require a more watery mix than the others. Adjust the formula a little each time you pour untl you reach the perfect consistancy for the mold you are pouring. Photos courtesy of Ken Hoobler, Artscape Molds Starting Your Own Concrete Business - Video C asting process Pouring concrete into molds Pouring into a mold must be done carefully so as not to create air bubbles or air pockets. One of the greatest enemies of ornamental concrete are bug holes. Bug holes are caused by air being trapped in the mix and not being able to escape, thus you end up with a hole in the finished product To properly pour concrete into your mold start by poring slowly into the center of the mold.
Vibration is recommended while pouring.
On taller molds such as pedestals and planters with cores it is best to pour about one third of the mold at a time with a few seconds of vibration between each pouring section. When the pour is complete the concrete should have a creamy look to It around the edges of the mold. Coloring your concrete Pigmenting or adding color to your concrete during the mixing process is another popular method of color change from the standard grey. By adding pigments to your concrete you create yet another product to sell at an increased profit margin. A - Add pigment to concrete mix.