Plastering Questions

What is the chemical nature of surfaces like plaster?

• Acidic

• Inert

• Neutral

• Amphoteric

Plasterers are referred to as a wet trade because:

• they work with dry materials

• they use water in their materials

• they work outdoors

• they use wet paint

Plasters are porous because:

• They allow air and moisture to pass through.

• They are made of solid materials.

• They are waterproof.

• They are used for decoration.

Efflorescence is caused by:

• Moisture in the air

• Presence of soluble salts

• High temperature

• Lack of ventilation

A moister meter is used to measure the moisture content in materials. When would you use it?

• To measure temperature

• To measure humidity

• To measure moisture content

• To measure air pressure

Why should you not abrade bare plaster?

• It can damage the surface.

• It is unnecessary.

• It is too time-consuming.

• It is too expensive.

Describe a ‘mist coating’.

• A thin diluted layer of emulsion paint applied to a surface to improve adhesion.

• A type of waterproof coating used on roofs.

• A decorative finish applied to furniture.

• A protective layer used in automotive painting.

What coating is used on bare plaster when applying a solvent-borne paint system?

• Alkaline-resisting Primer

• Sealer

• Undercoat

• Topcoat

What causes crazing or rapid dry out of plaster?

• Excessive water in the mix

• High temperature and low humidity

• Improper mixing techniques

• Use of old or expired plaster

What causes dampness within plaster?

• Moisture infiltration

• Excessive heat

• Lack of ventilation

• Improper mixing