No preparation is necessary but if extensive reuse of timber mould. It is advisable to protect all new surfaces with Duplast MRW. For used mould all excess cement must be removed together with any surface deposits of previous oil. Duplast MRW should be applied by brush sponge or mould oil sprayer. If a sprayer is used, care should be taken to choose correct size of sprayer. Apply one thin coat on entire surface thinnest coating necessary to achieve effective coverage. Excessive application may lead to surface dusting and uneconomical too. Wipe or brush off any excess particles on the surface and apply one coat of Duplast MRW before to remove. Duplast MRW completely for recoating mould or shutter surface. Use strong industrial detergent together with stiff brushing then thoroughly rinse with water.