Creating resin Legos with reusable silicone molds
After my post last week about creating silicone putty molds to make Lego crayons, a few of you remarked that doing that was all well and good, but you wanted to see how well resin did in the molds.
Okay. Let’s do it.
I filled each mold cavity with resin and allowed it to cure overnight.
Demolding went as expected.
Here’s are the results:
The Lego brick cast with a nice shiny finish. The only blemish was a mistake I had made. When I pushed the putty around the brick, I left a small gap which created a line up next to the brick. That line filled with resin. (The same thing happened with the wax Lego brick, but it was much more noticeable here.) It can be sanded off (GRR!), but it’s more of a technique note for me to be aware of next time I use mold putty.
The Lego minifigure also turned out well, although I have a few technique points to remember there as well:
1. If I want the head to be more round, and not have the overflow that needs sanding, I need to push the mold putty more around the head. Otherwise, I need to sand him with a flat back.
2. When I first looked at the minifigure, I noticed his chest had a rougher finish than the rest of his body. (The rest of his body was a very smooth matte finish.) I immediately checked the crayon version and saw the same roughness. It must be from the sticker on the Lego. A light coating of the Resin gloss sealer spray should help to shine him right up.
3. The hands cast much better. (They broke off last week in the wax version.) There’s a little clean up to do, but I was happily surprised with the results.
My overall impression on using mold putty to cast resin items is that it works well for flat backed pieces, but something with some dimension may not cast as ‘smooth’ by the looks of all the clean up I have to do.
What has been your experience with using silicone mold putty to make molds? Is this something you want to try?