The principle of mixing is simple: just pour plaster on water. The realization presents however some difficulty because of the setting time (4 to 5 minutes). So you have to work with safety and speed, by precisely calculating the amount of plaster you can apply before it becomes unusable. If you have to cover a large surface, you have to prepare the plaster as you go or work in pairs: one person ruins the plaster while the other applies it.
- Cutting pliers
- Mixing plaster with a trowel
- Mix plaster with the "ball-kit"
Mixing plaster with a trowel
1. Pour the plaster into the water, in fine rain. Use a clean trough to avoid making a dirty plaster. The proportions water / plaster vary depending on the use of the mixture. Determine the proportions before mixing and always pour all the water before starting to sprinkle the plaster. Never add water after pouring the plaster, always respect the order: plaster on water, and not the opposite, for mixing.
2. To better sprinkle the plaster, pour it by hand in a fine rain in the trough, while mixing with a trowel. To avoid getting your hands dirty, use a trowel to sprinkle the plaster. Stir the mixture with the trowel.
3. Continue trowling gently to obtain a homogeneous liquid mixture; do not pour the plaster too quickly to avoid lumps. This operation, the most difficult in the plaster tempering, requires a real "helping hand". A plaster too beaten gives, after drying, a dead plaster, very friable. In masonry, mixing plaster remains a specialty: the plasterers know how to stir the mixture to obtain a dry plaster of optimal hardness.
Mix plaster with the "ball-kit"
1. The "kit-balls" allows the amateur to spoil the plaster in a trough without beating it. To make this tool, hammer large nails into the upper bar of a T, made by assembling (nailing) two small battens. Plant five nails spaced regularly.
2. Plant another nail in the T-leg and connect it to the first nails with galvanized wire. Tense the wire. Make an appropriate sized ball kit for the trough you are using: the upper bar of the T should be a little shorter than the width of the trough.
3. Place the cross bar of the kit in the trough after sprinkling the plaster on the water; perform back and forth to the tool, which allows to obtain a homogeneous mixture, "gently" without beating the plaster. The instrument removes lumps and mixes all the plaster, scraping the bottom of the trough. As soon as the cast begins to take, apply it. Do not wait: solid, the plaster becomes unusable. Never beat the plaster a second time: dead, it does not harden anymore. Once the job is done, wash the tools.
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