Have you always wanted to work with PU? Here is a step-by-step explanation of how to do it.
It's been a few months since I made the first original measuring banana. But it hasn't conquered the market yet.. Of course, there's only one reason for that: there are only two of them.
Time to change that!
And in order not to deviate from the original, I will use this as a master model for a mold to make a whole series of casts.
To do this we need to go through a few steps:
The original measuring banana has acquired some scratches and dents in the meantime. To prevent these from appearing in all subsequent bananas, I sand the measuring banana smooth in those places. Of course, it has its charm to leave some of this behind, but my experience is that it only looks messy in the final model.
When it is completely sanded I smear it with release agent. This agent ensures, as the name suggests, that you can get it out of the mold later. In principle silicone does not adhere to this but you never know.
We are going to cast the mold from silicone and to do this properly we need to make a container in which we are going to place the model.
I made a cone that now serves as a foot for the banana, which is a nice bonus, but its real function is later in the mold: then it is the funnel through which we will pour it.
The box itself I make from 9mm thick plywood which I also gave a layer of release agent. Here I noticed later that the silicone did stick. A layer of varnish on the wood could have prevented this.
How you make this container doesn't really matter, as long as you make sure it can't leak out.
Carefully fill the container with silicone, avoiding leaving large air bubbles on the model.
Once the silicone has completely hardened you can remove the wood and the mother model can be removed from the mold. To do this I first carefully cut a zigzag in the silicone. I do this so that I can use it later to align the parts. Once the zigzag is there you can continue cutting as straight as possible until you reach your model.
Now carefully remove the model.
Close the mold again and use two sticks and glue clamps to carefully clamp it down. You definitely don't want to do this too tight because you will distort your model but also not too loose because then it will leak through. So just try what works well.
To cast the banana I use a two component PU casting resin. For the right color I add some yellow dye and finally I also add about 150 grams of filler. This makes the final product a bit harder and ensures that you can cast a somewhat thicker layer.
I add all of these additives to component A before I add component B. That way I can mix it all together before it starts to harden.
Carefully pour everything into the mold in a thin stream and wait until it has hardened before opening the mold.
Products used:
This video is sponsored by Silicones & More. Do you need products to cast things yourself? They know what you need!
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