Concrete Relief-Cast Botanical Specimens
Introduction: Concrete Relief-Cast Botanical Specimens
Isn't nature amazing?! Do you wish you could capture it 'forever'? YES you can! In a couple easy steps you CAN capture it in concrete!
I have worked in concrete for many years and have designed very unique projects but this one is so impressive for a small amount of work and readily available supplies!
Supplies
* Botanical Specimens (look closely to find ones that have a good structure and thickness works best)
* 100% Silicone Caulking ( Silicone Caulking #1, not #2)
* Cornstarch
* Bowl for mixing
* Gloves
* Rolling pin
* xacto knife
* Concrete Mix (this is a special strong one)
* frame shape for pouring concrete
* mixing container (flexible is best) & mixing stick
* wire for hanging loop
* plasticine (opt)
* acrylic paint, medium, brushes etc
Step 1: Make Your Molding Material
This method does not involve making a plaster cast first as I did in this tutorial. That works as well but has extra expense and more steps. This does however mean that you will be jumping right to the mold-making step.
Before making the mold mix plan your Botanical specimens as you will not have time later. Also get the rolling pin ready. A sheet of some clear plastic (like from a package), or some parchment paper helps keep from sticking to rolling pin.
This recipe for making a silicone mold works really well! I have used it in many projects. It does sometimes take a bit of practice to get used to the mixing. I liken it to making a pie crust or bread dough. You do want to make sure it is mixed, not too sticky and not too dry. I do not measure as humidity can be a factor.
I used enough cornstarch to line a bowl and then squirt about half a tube of the caulking in the middle. Toss and toss and try to keep it in the cornstarch and not al over your gloved fingers. Pasta dough often starts like this in a mound of flour...
This mixture will cure really quickly so you do need to have all the material ready. Work fast...
Step 2: Imprinting the Botanical Specimens
Once you have a nice well mixed ball of 'mold dough' it is time to get it flat with the rolling pin. I decided to cut the outer shape afterward so I only was concerned with my arrangement of the plants. These are succulents so the are quite thick and detailed.
Place them on the 'Mold-dough' and cover with paper/board and roll with the pin. The plant will sink into the dough somewhat. 353
You can do all at once or one at a time... I used this method when I cast an artifact mold and it worked great!
Whenever I use a new media I like to have a small test run. Then I can see how it reacts and what I need to know before I waste a lot.
After all the botanical species have been pressed well into the 'dough' wait until it has cured. When you press on the 'dough' it will feel like a solid rubber, then it is cured; it only usually takes minutes.
Pull the plants out fo the mold. If you need help use some toothpicks, pins or tweezers to get parts out. You will be amazed at the detail it captures. For my round mold I found a cake cover that I cut to make a frame for the casting. I cut my silicone mold to fit snuggly in the circle. Also place it where it is level before pouring.
Step 3: Pour Your Concrete
Ok, before you go and get the cheap typical concrete make sure you know what you need! So many people buy the wrong kind since there are so many kinds. This post will help! Also, if you are nervous about working with concrete I have some tips for you!
I prefer the Rapidset Cementall mix since it is fine and strong and sets in one hour!!!
It does use little water so do not add too much at first. It should be like a thin gravy consistency to flow into the details. Stir well to make the bubbles come to the surface.
Pour into the well secured mold (use some plasticine if you want to hold mold and not loose any concrete) The problem can be bubbles! Tap and bang the mold to make the bubbles rise. Also using an old brush and working through the mix gets it into the small details
To make a hook to hang bend some wire to form a loop and imbed that into the concrete. Now it's time to wait... It goes fast!
Step 4: Unmold the Magic!
This concrete mix sets and cures in one hour! 353