Breathaplasta Smooth is ideal as a healthy skim coat applied directly to conventional gypsum plasterboard without the need for a primer. Smooth is a lime-based, fine finishing plaster designed to be a super smooth final surface finish to walls and ceilings.

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Equipment required

Breathaplasta Smooth, clean water
Hawk, trowel and plastering tools

Recommended plaster thickness

Approx. 2mm total thickness

Coverage per 20kg Smooth bag

Approx. 12 square metres at 2mm thickness

Setting time per coat

Approx. 45-60 mins in warm, dry conditions, or 90-120 mins in cold, damp conditions

Surface preparation

No treatment or priming is required before applying plaster to conventional gypsum plasterboard (ivory coloured paper).

Specialist plasterboard requires a primer (bonding agent) to be used before plastering. Examples include: moisture resistant (green), fire resistant (pink), and acoustic (blue).

Recommended plaster application

  1. Mix Smooth to approx. 7 litres of cool, clean water per 20kg bag of dry powder used.

  2. Mix the plaster using a paddle mix for at least 2 mins. Leave the mix to stand for 5-10 mins, then mix again for 1 min.

  3. Base coat of Smooth at 1-2mm.

  4. Top coat of Smooth at 1-2mm.

  5. After the top coat is set, hard trowel to compress to 2mm total thickness. Trowel smooth. Optionally, apply a lightly dampened sponge float to the plaster in smooth circular motions, then with a clean finishing trowel, glide over the plaster to achieve a smooth surface finish. Be careful not to overwork the plaster at this stage. Do not use water to aid finishing.

Bag calculator

Use this calculator to work out how many bags of Universal to order for your job.

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