Painting Exterior Walls

TUTORIAL 2:

PAINTING EXTERIOR WALLS

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Determining your product requirement:

• Measure the surface area you wish to
• Determine which products are needed for the surface you wish to paint and the finish you wish to achieve.
• Check the Theoretical Spread Rates (TSR) on each of the specified products and see how many coats of each are recommended, then calculate what quantities of each product you will require, remembering to make adjustments for the porosity for each surface. TSRs are based on products applied to smooth, sealed (E.g. an unsealed scratch plaster surface will absorb more paint than a sealed smooth one, so allow for a lower spread rate on porous surfaces).
• Check out the specifications on all the top coat choices (referring to the relevant data sheets) and decide which is right for

EXTERIOR WALLS

NEW SMOOTH CEMENT PLASTER

Surface Preparation

1. Brush the plaster to remove loose friable
2. Check the plaster quality by rubbing it with your hand, if friable material continues to fall from the plaster, then it is of poor quality, if the plaster is firm when rubbing, and does not release any particles after being dry brushed, then it is of good
3. If the plaster is very smooth and of good quality, then apply 1 coat of Paintcor’s Plaster Prime Trade or Allow 6 hours @ 25 degrees C to dry.
4. If the plaster is of poor quality (continues to release particles after brushing) then dilute AcrySeal 1:1 with water and apply to the plaster. Allow 45 minutes to dry @ 25 degrees

Application Method.

1. Apply 2 top coats of your choice. Allow to dry between coats.

Where PlasterPrime Should Be Used.

PlasterPrime should only be used on all new GOOD QUALITY plaster, on plaster below D.P.C. and after the

application of Paintcor’s KlinkaSeal to stop rising damp.

All plaster can be sealed with Paintcor’s AcrySeal before painting especially if corrective coatings are going to be used like FlashSkim, SubTex or AcrylUnder. AcrySeal must not be used over Paintcors KlinkaSeal damp proofing system.

Please Note: Friable or under bound plaster must first be sealed with Paintcor’s AcrySeal to bind the poor plaster before Undercoats and top coats are applied.

Relevant Product Information

AcrySeal
Theoretical Spread Rate	10-15m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	45 minutes

AcrylUnder
Theoretical Spread Rate	5-6m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

Plaster Primer Trade and Premium
Theoretical Spread Rate	8-10m² per litre
No. of Coats required	1
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±6 hours

Top Coat Choices

Elegance (Matt or Silk)
Theoretical Spread Rate	8-10m² per litre
No. of Coats required	2 Coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±45 minutes per coat

Pristina
Theoretical Spread Rate	New Plaster: 4-5m² per litre
	Painted Smooth Plaster: 7-8m² per litre
No. of Coats required	2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – ±45 minutes per coat

SatinTex
Theoretical Spread Rate	4 – 6 m² per litre
No. of Coats required	1 – 2 Coats depending on desired finish
Application Method	Sponge or Sheepskin Roller
Drying Time	@ 25°C – 2 hours touch dry
	Overcoat after 6 hours

Essence
Theoretical Spread Rate	8m² per litre
No. of Coats required	2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C ± 45 minutes per coat.

NEW SCRATCH CEMENT PLASTER

Surface Preparation

1. Brush plaster to remove loose friable
2. Damp proofing as per Tutorial #6, New

Application Method

1. Apply 1 liberal coat of Paintcor’s SealerMix directly to the new plaster with a brush, roller or airless spray. Allow to
2. Apply 1 coat of Paintcor’s AcrylUnder with a brush, roller or airless spray. Allow to dry.
3. Apply 2 top coat of your Allow to dry between coats.

Relevant Product Information

SealerMix
Theoretical Spread Rate	8m² per litre
No. of Coats required	1 liberal Coat
Application Method	Brush, Roller or Spray
Drying Time	Allow 45 minutes before overcoat

AcrylUnder
Theoretical Spread Rate	5-6m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

Top Coat Choices

Elegance (Matt or Glo)

Theoretical Spread Rate	8-10m² per litre
No. of Coats required	2 Coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±45 minutes per coat

Essence
Theoretical Spread Rate	8m² per litre
No. of Coats required	2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C ± 45 minutes per coat.

Pristina
Theoretical Spread Rate	New Plaster: 4 – 5m² per litre
	Painted Smooth Plaster: 7-8m² per litre
No. of Coats required	2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

NEW WOOD FLOATED CEMENT PLASTER WITH TEXTURE DIFFERENCES

Surface Preparation

1. Brush plaster to remove loose friable particles.

Application Method

1. Apply 1 coat AcrySeal diluted 1:1 with Allow to dry.
2. Apply 1 coat SubTex with a sponge roller (for a low relief ripple finish) or with sheepskin roller (for a textured finish) allow to A second coat of SubTex may be applied if scarring is bad.
3. Apply 2 top coats of your Allow to dry between coats.

Relevant product information:

AcrySeal
Theoretical Spread Rate	10-15m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	45 minutes

SubTex
Theoretical Spread Rate	Ripple Roller: 3m² per litre
	Sheep Skin Roller: 4.5 – 5m² per litre
No. of Coats required	1 Coat, 2 Coats if necessary
Application Method	Brush, Roller
Drying Time	@ 25°C – 1 hour

Top Coat Choices

Elegance (Matt or Glo)
Theoretical Spread Rate	8-10m² per litre
No. of Coats required	2 Coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±45 minutes per coat

Essence
Theoretical Spread Rate	8m² per litre
No. of Coats required	2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C ± 45 minutes per coat.

Pristina
Theoretical Spread Rate	New Plaster: 4-5m² per litre
	Painted Smooth Plaster: 7-8m² per litre
No. of Coats required	2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

SatinTex
Theoretical Spread Rate	4 – 6 m² per litre
No. of Coats required	1 – 2 Coats depending on desired finish
Application Method	Sponge or Sheepskin Roller
Drying Time	@ 25°C – 2 hours touch dry
	Overcoat after 6 hours

PREVIOUSLY PAINTED WALLS IN ACRYLIC

Surface Preparation

1. Remove all loose peeling paint if
2. Where paint has been removed, feather the edges of remaining paint to zero with sand paper. Remove sanding
3. Check existing paint for chalk by rubbing the surface with your finger tip, if the colour of the wall is left on

your finger after rubbing, then the old paint system is breaking down and starting to “chalk”.

4. Check for Algae, if present, treat as per Ushevu
5. Wash wall down to remove all dirt, dust and any old chalking Allow to dry.
6. Open and clean See crack and skimming tutorial.

Application Method

1. Prime exposed plaster and cracks with 1 coat AcrySeal diluted 1:1 with water. If the old paint system was chalking then prime all surfaces to be painted with AcrySeal diluted 1:1 with water. Allow to
2. Repair cracks with FlashPatch Exterior (see crack and skimming tutorials). Allow to dry
3. Apply 1 coat AcrylUnder to all primed exposed cement plaster and repaired Allow to dry.
4. Apply 2 top coats of your choice. Allow to dry between coats. Two coats are required for long term

Relevant Product Information

Ushevu
Theoretical Spread Rate	20m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 24 hours

AcrySeal
Theoretical Spread Rate	10-15m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	45 minutes

AcrylUnder
Theoretical Spread Rate	5-6m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

FlashPatch
Theoretical Spread Rate	N/A
No. of Coats required	N/A
Application Method	Trowel or Scraper
Drying Time	@ 25°C – 1 hour

Top Coat Choices

Elegance (Matt or Glo)
Theoretical Spread Rate	8-10m² per litre
No. of Coats required	2 Coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±45 minutes per coat

EnviroCoat
Theoretical Spread Rate	10m² per litre
No. of Coats required	1 or 2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes surface dry

Satintex
Theoretical Spread Rate	Ripple: Sponge Roller: 4 – 6m² per litre
No. of Coats required	1 – 2 Coats depending on desired finish
Application Method	Sponge or Sheepskin Roller
Drying Time	@ 25°C – 2 hours touch dry
	Overcoat after 6 hours

Essence
Theoretical Spread Rate	8m² per litre
No. of Coats required	2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C ± 45 minutes per coat.

Pristina
Theoretical Spread Rate	New Plaster: 4-5m² per litre
	Painted Smooth Plaster: 7-8m² per litre
No. of Coats required	2 Coats
Application Method	Brush, Roller or Spray

Drying Time

@ 25°C – 45 minutes

PREVIOUSLY PAINTED WALLS IN ENAMEL

Surface Preparation

1. Remove all loose peeling paint if
2. Where paint has been removed, feather the edges of remaining paint to zero with sand paper. Remove sanding
3. Check existing paint for chalk by rubbing the surface with your finger tip, if the colour of the wall is left on your finger after rubbing, then the old paint system is breaking down and starting to “chalk”.
4. Check for Algae, if present, treat as per Ushevu
5. Wash wall down to remove all dirt, dust and any old chalking Allow to dry.
6. Open and clean See crack and skimming tutorial.
7. Sand existing enamel to a smooth matt finish and remove all sanding

Application Method

1. If peeling paint has been removed exposing cement plaster, then prime exposed cement plaster only with 1 coat AcrySeal diluted 1:1 with Allow to dry.
2. Apply 1 coat of UniSub universal undercoat to old sanded Allow 6 hours @ 25 degrees C to dry.
3. Apply 2 top coats of your choice, allow to dry between

Relevant Product Information

AcrySeal
Theoretical Spread Rate	10-15m² per litre
No. of Coats required	1 coat
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes

UniSub
Theoretical Spread Rate	8m² per litre
No. of Coats required	1 coat
	New Doors 2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 1 hour surface dry
	@ 25°C – 5 hours hard dry

Top Coat Choices

HiGlo

Theoretical Spread Rate	10m² per litre
No. of Coats required	1 – 2 coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 2 hour surface dry
	@ 25°C – 7 hours Hard Dry
LoGlo
Theoretical Spread Rate	10m² per litre
No. of Coats required	1 – 2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 2 hours Surface Dry
	@ 25°C – 7 hours Hard Dry

Elegance (Matt or Glo)
Theoretical Spread Rate	8-10m² per litre
No. of Coats required	2 Coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C @ ±45 minutes per coat

EnviroCoat
Theoretical Spread Rate	10m² per litre
No. of Coats required	1 or 2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes surface dry

Essence
Theoretical Spread Rate	8m² per litre
No. of Coats required	2 coats minimum
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C ± 45 minutes per coat.

Pristina
Theoretical Spread Rate	New Plaster: 4-5m² per litre
	Painted Smooth Plaster: 7-8m² per litre
No. of Coats required	2 Coats
Application Method	Brush, Roller or Spray
Drying Time	@ 25°C – 45 minutes