I am getting so excited working with moulds lately.  I use an epoxy resin which is easy to use and comes out of the Prima Marketing moulds so well.  The epoxy resin set comes in two bottles and I mix two tablespoons of each in a cut and stir for two minutes and then pour in the moulds and set for about 12 hours depending on the depth of the mould.  I bend the moulds and the casting pops almost out.  I gently pull the casting out of the mould.  I cover each casting with a gesso which I used in the video the Prima Marketing Clear Gesso.  I let dry and then brush or sponge on the Prima Marketing metallic waxes.  Note, wear gloves with this along with covering the table with plastic garbage bags or something you can throw away since the resin gets all over the place.  Also, I used a clay knife to get the resin back in the casting in the mould as much as possible.  When it dries, there will be a little left over resin around the casting which will be removed with you fingers, therefore, less resin around the casting can be prevented with using a clay knife after pouring to get as much resin that is on top back into the casting.  Also, pour slowly but I used my clay knife and scrap it in the cup and let it dripped into the casting so that the resin don't over flow.  In a few months of working with these moulds, I will probably have a better technique in pouring the resin in these moulds.