For those of you who have been following my facebook page: [link] you have seen my experiments with mold making and sculpture!
Conclusion: Latex molds are not so great. Basically you have to paint thin layers of the liquid latex over your sculpture. Each layer has to dry 100% before you proceed with the next one. They recommend you use a hairdryer to help with the process. Hairdyer+latex= the worst smell ever. After about 6 hours (15 layers of latex), I gave up and ripped the mold off of my poor little scupley toad. Thankfully, the process didn't hurt him! I tried pouring some plaster into the latex mold, but the toad that came out definitely didn't look like the sculpture.
Next I tried RTV silicon. You get 2 bottles, which you mix together and pour over the sculpture. It sets in 6 hours and no hairdryers are involved. You just pour it, and leave it. Come back later and you will have a strong, flexible rubber mold ready for casting! I made resin casts out of the mold, so the sculptures would be more durable.
Overall, it was a really fun experiment, and I am excited to try more!