kirksmithicus
05-06-2011, 01:11 PM
I wanted to make some cacti for my Dark Sun campaign and decided to finally try the mold making kit that I got from my wife as my Christmas present. I figured it would be a fairly easy and straight forward project for my first attempt.
I opted to use regular modeling clay, something that quite a few people I know, and a few internet sites claim aren't that good, or can't be used at all with latex molds. I figured that since it came with the kit, it was supposed to be used as filler for the cracks in the mold box, and the instructions pointed out that the modeling clay would not interact or prevent the latex for curing, that it would be okay to use.
The modeling clay is much easier to use than the green stuff, but it never hardens. I decided to use some old square miniature bases and 1 inch washers as bases. For most of them I just rolled out some balls of clay and made little dimples in them like you would see on a golf ball and glued them to their base. The larger one next to the blue cacti was a little more involved but wasn't terribly hard. As a precaution, I covered it with a single coat of PVA. Then you glue the whole thing to the base of the mold box, let it dry and then pour in the latex. You let the whole thing cure over night, then viola, you have a mold. Not too bad a little project.
The next day I mixed up some resin and cast the pieces. Be sure to keep the molds warm in the oven, otherwise the pieces don't set up right.
The results were varied. The smaller pieces came out fine, and so did several of the larger cacti. I had some trouble with a set not pictured here. It seems I made them to large at the top and with too many pointy bits. The pointy bits trapped air and didn't turn out, then I had to cut the molds in half to get the pieces out.
Here is a picture of my first batch, the second batch is in the mold box in the back, and the pink thing with modeling clay jammed in the cracks. I threw in another project, which is the goods for my market stall over on the left. I figured it would be an easy project, just an animal fur and a few baskets on a rug.
http://farm6.static.flickr.com/5023/5693414757_746642fdbb_z.jpg
I opted to use regular modeling clay, something that quite a few people I know, and a few internet sites claim aren't that good, or can't be used at all with latex molds. I figured that since it came with the kit, it was supposed to be used as filler for the cracks in the mold box, and the instructions pointed out that the modeling clay would not interact or prevent the latex for curing, that it would be okay to use.
The modeling clay is much easier to use than the green stuff, but it never hardens. I decided to use some old square miniature bases and 1 inch washers as bases. For most of them I just rolled out some balls of clay and made little dimples in them like you would see on a golf ball and glued them to their base. The larger one next to the blue cacti was a little more involved but wasn't terribly hard. As a precaution, I covered it with a single coat of PVA. Then you glue the whole thing to the base of the mold box, let it dry and then pour in the latex. You let the whole thing cure over night, then viola, you have a mold. Not too bad a little project.
The next day I mixed up some resin and cast the pieces. Be sure to keep the molds warm in the oven, otherwise the pieces don't set up right.
The results were varied. The smaller pieces came out fine, and so did several of the larger cacti. I had some trouble with a set not pictured here. It seems I made them to large at the top and with too many pointy bits. The pointy bits trapped air and didn't turn out, then I had to cut the molds in half to get the pieces out.
Here is a picture of my first batch, the second batch is in the mold box in the back, and the pink thing with modeling clay jammed in the cracks. I threw in another project, which is the goods for my market stall over on the left. I figured it would be an easy project, just an animal fur and a few baskets on a rug.
http://farm6.static.flickr.com/5023/5693414757_746642fdbb_z.jpg