RLA Penapatch Fairing Coat Mortar

Name: RLA Penapatch Fairing Coat Mortar
Brand: RLA
SKU: MORTARRLAFC/20
Price: 78.94 AUD
Availability: InStock

A fine-textured fairing coat that smooths concrete blemishes before coatings, without showing through. Feathers to 5mm at 20 MPa, with a 25-minute window to place and finish at 20°C.

Vendor: RLA

SKU: MORTARRLAFC/20

Availability: In Stock

$78.94; $78.94
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Flat-rate shipping $17.95 + GST (metro and standard zones). Excludes remote/regional/high-cost postcodes and certain items (DG, oversized, long-length, or bagged products 15 kg+). If your order includes any of these, we will contact you to arrange additional freight charges. Online purchases only.

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Description

RLA Penapatch Fairing Coat Mortar is a fine-textured, fast-setting cementitious fairing compound for thin repairs and finishing work on concrete and compatible masonry. It is designed for surface defects where only a shallow layer is needed, producing a smooth finish that can be left exposed or overcoated without telegraphing surface imperfections.

Where it fits

Fairing and smoothing off-form or precast concrete.
Filling blowholes, minor surface defects and local imperfections.
Finishing over other RLA repair mortars to create a more uniform surface.
Internal and external vertical applications on compatible concrete and masonry.

Build and finish

Apply from a feather edge where appropriate up to a maximum of 5mm in a single application. The mortar is mixed with clean water and trowelled to the required finish. Its fine texture is intended for surface correction rather than deep structural reinstatement.

Preparation

Remove oil, grease, laitance, weak concrete and other contamination that may reduce bond. New concrete should be adequately cured before application. Pre-soak the substrate with clean water and remove standing water before placing the mortar. On highly porous surfaces, RLA recommends its compatible bonding/priming system to reduce flash drying.

When not to use it

Do not use it as a substitute for a high-build structural repair mortar where significant section loss must be reinstated.
Do not exceed the manufacturer’s maximum application thickness.
Do not retemper material that has started to set.
Do not apply below the manufacturer’s minimum application temperature.

Compare the range: For deeper repairs, see Masonry Repair Mortars and Concrete Repair Mortars.

Common Questions

What is Penapatch Fairing Coat used for?
It smooths minor surface imperfections and defects in concrete and masonry before coating or as a fine exposed finish.

How thick can it be applied?
From feather edge up to about 5mm in one application.

What compressive strength does it reach?
About 20MPa at 28 days.

Can it be used over rising damp?
No. Rising damp and persistent wet conditions are excluded.

Uses & Benefits

Fine-textured polymer-modified cementitious fairing coat for smoothing surface imperfections in concrete and masonry. Suitable for internal and external vertical applications. Can be applied from feather edge up to about 5mm in a single application. Produces a smooth finish suitable for overcoating or leaving exposed where appropriate. 28-day compressive strength is about 20MPa.

How To Apply

Prepare the substrate by removing weak concrete, laitance, dust, oil and contamination. Pre-soak porous concrete and remove standing water before application. Use Rendergrip A on highly porous surfaces where required. Mechanically mix the powder with about 5.9–6.0 litres of clean water per 20kg bag until smooth. Apply by trowel from feather edge up to about 5mm and finish without overworking. Allow the specified cure before decorative or protective coatings.

Limitations and Safety Info

Do not use in areas subject to rising damp or persistent wet conditions. Do not apply below 5°C or above 35°C. Do not expect the fairing coat to bridge structural movement; cracks in the substrate can reflect through. Do not exceed the specified mixing-water range. New concrete should be adequately cured before application.

Suitable Substrates

Concrete.
Precast and off-form concrete.
Masonry.
Existing compatible RLA repair mortars.

RLA Penapatch Fairing Coat Mortar Physical Properties
Property	Value
Density	1800 kg/m³
Application Temperature	Min 5ºC - Max 35ºC
Mixing Ratio	5.9 – 6.0 litres
Coverage	14 litres
Flexural Strength (1 day)	3.0 MPa (ASTM C348-86 @ 20ºC)
Flexural Strength (7 days)	5.0 MPa (ASTM C348-86 @ 20ºC)
Flexural Strength	7.1 MPa (ASTM C348-86 @ 20ºC)
Compressive Strength (1 day)	4 MPa (AS1012 & AS2073 @ 20ºC & 50% RH)
Compressive Strength (7 days)	18 MPa (AS1012 & AS2073 @ 20ºC & 50% RH)
Compressive Strength	20 MPa (AS1012 & AS2073 @ 20ºC & 50% RH)
Drying Shrinkage (7 Days)	<100 microstrain (AS 1012.13)
Drying Shrinkage (28 Days)	<300 microstrain (AS 1012.13)
Drying Shrinkage (56 Days)	<450 microstrain (AS 1012.13)
Set Time	25 minutes (@ 20°C)
Setting Time (Final)	50 minutes (@ 20°C)
Overcoat Window	48 hours (10ºC – 35ºC)
Shelf Life	12 months
Pot Life	25 minutes
Wet Density	1800kg/m³

Civil Construction

Vertical concrete defect repair

For cosmetic repairs on vertical concrete elements like columns or soffits, requiring a smooth, fast-setting application.

Its rapid set and excellent workability allow efficient vertical application and feather-edging, achieving a durable, smooth finish without sag.

Vertical applications
25 minutes working time
Up to 5mm thickness
28-day 20 MPa compressive strength

Civil Construction

Smooth concrete surface defects

When concrete surfaces exhibit bug-holes, tie holes, or minor imperfections requiring a uniform, thin-layer aesthetic finish.

Its fine texture and negligible shrinkage create a seamless, coatable surface, effectively hiding defects up to 5mm in a single application.

Max 5mm single application
Negligible drying shrinkage
25 minutes initial set
28-day 7.1 MPa flexural strength

Masonry

Concrete Surface Prep for Coatings

When preparing concrete or pre-cast panels with minor imperfections for subsequent architectural coatings or paints.

Its fine texture, negligible shrinkage, and strong bond create a smooth, durable base that won't show through final coatings.

5mm single application
Smooth textured surface
<100 microstrain 7 days
Over-coated within 48 hours

Civil Construction

Fine finish over concrete repair

After larger concrete repairs, to achieve a smooth, uniform texture ready for architectural coatings or left exposed.

Provides a fine, smooth finish that prevents telegraphing imperfections through coatings, offering a durable, aesthetic final layer internally or externally.

Smooth textured surface
Coatable after 48 hours
Can be left exposed
Negligible drying shrinkage

Civil Construction

Exposed Concrete Surface Finishing

For cosmetic repairs on concrete surfaces where a uniform, durable, and light grey finish is desired without further coatings.

Delivers a robust, smooth, light grey surface that resists minor wear, suitable for leaving exposed internally or externally.

Left exposed finish
Light Grey colour
20 MPa compressive 28 days
Internal and external use

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Where it fits

Build and finish

Preparation

When not to use it