Half Bubble Mould 428 is a durable, smooth, reusable polyethylene mould that that can be used for the base of a trophy or doll stand, or used as a container when making silicone moulds. Mould: 10cm x 2.5cm - 1.9cm deep, holds 240mls How to Use Resin Moulds: Remove any dust, etc. from your mould. This resin mould is reusable and made of durable, smooth polyethylene or polypropylene. Moulds do not require mould release when casting with resin, however, it is strongly suggested. We recommend the use of Castin' Craft Mould Release/Conditioner. Instructions: Protect your work area with freezer or wax paper. Treat moulds with mould release/conditioner. Place mould tray on a level surface. Fill the mould cavities to just below the top. Once the pieces are cured, turn the tray over and press the centre area of each piece to release; flex if necessary.