[header] How to mold plastic [title] Prepare the master part. [step] The master part is the item that you will use to create the mold. [substeps] To prepare the master part, first wipe down or wash the item. 
Once clean and dry, apply a release agent to the original item-this will ensure that the master part will pop free from the mold. Coat the item with a layer of bubble buster-this product prevents the formation of air bubbles around the master part.