Gently sprinkle the plaster into the water and allow the material to sink allow a few minutes for the powder to properly soak. ![]() Use a clean container that will hold around 3x the volume of the loose plaster powder, to ensure plenty of space for mixing the paste. Measure out the correct amount of water use tap water only. Weigh out the required amount of plaster into a clean dry vessel break up any clumps in the powder at this stage. If you haven’t used plaster-of-Paris before you will probably be surprised how runny the fresh mix appears to be. Setting times can be retarded by 10 - 15 minutes simply by adding culinary lemon juice at the rate 1 - 2 teaspoonfuls for each litre of water used. ![]() Old plaster or plaster that has been stored in damp conditions sets more quickly, as does unset plaster brought into contact with freshly-set plaster. 700g) of water for every kilogram of plaster powder used. Fine Casting Plus (70:100) requires 0.7 litres (i.e. General mixing guide Unless similar pieces have been made previously, it is good practice to carry out a trial with a small amount of material to establish the ideal consistency for the particular type of work and setting time: this is particularly important with impression work Except for non-critical work always weigh the plaster and use a calibrated jug, etc., for measuring the water, using the water to powder ratios shown in brackets in the left hand column of the table below, e.g. ![]() Casting, Moulding & Modelling - Materials & Kits
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