Intro: Casting Concrete Ornament Using Latex Molds.
There are different sorts of concrete mixes which will yield everything from rough as above in the feline , or a smooth finish like carved stone.
In this case we do a fast , straight forward mix and pour , the mold was agitated by hand only ( Shaken. )
Step 1: Latex Mold.
We used a latex mold , see my other videos here on instructables at oldschoolwood.
The mix was done with a home mix purchased at the hardware store. It is mixed in a bucket with a paddle and drill .
It is then poured into a mold treated with mold release ( castin' craft brand in this case , ) and then agitated by hand to bring up bubbles .
The mix was careless and allowed some grit ( small stones ) to build up here and there in crevices and hollows. This produces a relic like appearance to the finished ornament.
Step 2: Smooth Mix With Resin.
A smoother mix using a resin based tile cement was used here. The pour was gentle and the mixing was done using my fingers to create as few bubbles as possible . Then it was hand shaken to release any bubbles.
Step 3: The Demolding of the Concrete After a Day of Setting.
These pieces are for my garden . Concrete lasts for decades when sealed or painted .
Coloring can be done in the mix stage itself.
Step 4: An Experiment With Countertop Mix .
I just tried to cast a Countertop mix ( commercial product.) I colored it with powdered pigment . At 24 hours the cast fell apart in my hands and had shrank about one percent or so . The detail might have been good but the thing fell apart.
I have one other cast which I shall let set for a week before pulling it .
This one came out like a green sand cast .
I shall try the non colored mix next , straight from the bag , as an experiment . The surface texture could be very nice.