Mold Making Adventure

When I was younger I had a set of silicone molds from Hirst Arts which I used to cast plaster bricks and various other forms which were then assembled into castles, bridges, and other scenery.

We'd like to be able to create our own molds to increase our throughput of small production runs.

We decided to create a mold of the "I Love you Box" to capture the intricate details.

We start using Oomoo 30 by Smooth-On, mixing parts A and B by themselves.

Then after we roughly estimated the volume required by the size of the box we made, we began mixing equal volumes of part A and part B together

Mix thoroughly until the colors are evenly blended.

The we poured into our makeshift box to which we super-glued the I love you box down to. We probably should have brushed the silicone on the sides to increase detail reproduction. We also probably could have mixed a bit better as you can see some pink coloration in the mold. We used quite a lot of material for this mold; I'm thinking there is a more efficient way to get this job done.

This is the best part, pulling the box apart.

Cleaning up "leaky" corners.

Carefully removing the I love you Box.

Details came out very nice, feels good. I wasn't sure if the details would resolve since I didn't paint the silicone on the outside.

Impatient I immediately grab our 10 year old dental plaster and begin mixing.

Check out all those bubbles, these will cause issues later on.

Ok this is actually our 2nd cast into this mold. The first one had a lot of bubbles in it. This 2nd cast still contains bubbles, but overall I'm very happy with the quality of the reproduction. You can see the layer-lines from the print, so it would have been beneficial to sand the inside of the original before molding.

Second and first castings side by side. We painted the first with metallic gold acrylic paint to bring out the details.