First, you need to use mold making silicone rubber making a silicone mold for art craft you need to reproduce.

a) Take silicone rubber and add catalyst and mix them evenly. (mix ratio :100:2-4)

b) Evenly and slowly perfuse the mixed silicone rubber into the square fram. After the cross linking reaction and the silicone rubber turns dry,you can take the products out. Thus, the mold has been done.

Second, you can use silicone mold making an art craft.

you can pouring raw material, like resin, gypsum, plaster, into silicone molds. Then take the products out after silicone mold cured completely. Then an art craft is done.