KingPlast WR100®
Single-component, polymer-modified water-resistant cementitious plaster with integral hydrophobic protection.
SpecWorld has the Spec Pack, CSI specification and drawings for registered specifiers.
- Compressive strength
- > 6 MPa @ 28 days
- Fresh wet density
- 2.0 ± 0.1 kg/ltr
Overview
KingPlast WR100 is a single-component, polymer-modified, ready-to-use cementitious plaster with integral water-repellent (hydrophobic) protection. It is a factory blend of cement, graded sand, limestone, mineral aggregates, selected polymers, reinforcing fibres and a silicone-based hydrophobic admixture which, when mixed with clean water, produces a thixotropic mortar for plastering vertical and overhead surfaces.
The integral hydrophobation is distributed throughout the hardened plaster, reducing capillary water absorption and producing a durable, water-resistant matrix while retaining good water-vapour permeability. This limits the transport of water-soluble salts, reducing efflorescence and helping to protect embedded steel and host concrete.
Where to use
Water-resistant plastering and rendering of concrete and blockwork surfaces, internally and externally – particularly where protection against driving rain, capillary moisture and efflorescence is required, such as facades, plinths, parapets, basements and wet areas exposed to damp conditions.
Why use it
- Integral water repellency – reduces capillary water absorption throughout the plaster, not just at the surface.
- Reduces efflorescence and chloride absorption, protecting steel reinforcement and host concrete.
- Retains good water-vapour permeability – the substrate stays breathable.
- Shrinkage-controlled and highly resistant to alkalis.
- Thixotropic high build for vertical and overhead work; single component (add water only).
- Suitable for internal and external use; applied by trowel or spray.
Technical properties
| Colour | White and grey (range of colours available) |
|---|---|
| Chemical basis | Polymer-modified cement with integral silicone hydrophobe |
| Fresh wet density | 2.0 ± 0.1 kg/ltr |
| Maximum aggregate size | 1 mm |
| Compressive strength | > 6 MPa @ 28 days |
| Water absorption | Low – integral hydrophobic matrix |
| Water-vapour permeability | Good (breathable) |
| Application thickness | 2 – 25 mm per coat |
| Water demand | 4.0 – 4.5 litres per 25 kg bag |
| Frost sensitivity | Not sensitive to frost |
Standards and approvals
KingPlast WR100 complies with ASTM C150 Type I, ASTM C897 and application standard ASTM C926.
How to use
Method of use
Substrate Preparation
The substrate must be sound, clean and free from oil, grease, dust and laitance. Pre-wet the surface with clean water to a saturated surface-dry condition, leaving no standing water, before applying the plaster.
Priming
Normally no primer is required; pre-soaking the surface with clean water is sufficient. Where increased bond is required, or on smooth fair-faced surfaces, apply a suitable bonding primer or a dash / slurry coat before plastering. For guidance on bonding primers and dash coats, the KingKrete Technical Department can be consulted.
Mixing
Use a mechanically powered mixer or drill fitted with a suitable paddle. Add 4.0 – 4.5 litres of clean water per 25 kg bag to a clean container, then add the powder slowly to the water while mixing continuously at low speed (400 – 600 rpm). Continue mixing until a uniform, lump-free consistency is obtained.
Placing and Finishing
The suitable application thickness is 2 – 25 mm. Where greater thickness is required, apply a further layer wet-on-wet after the first has initially set (3 – 6 hours). Apply by trowel with firm pressure to fully compact the mortar and ensure good adhesion to the substrate. Level initially with a wooden or plastic float and finish with a slightly water-damped steel float.
Spraying Application
KingPlast WR100 may be applied using suitable plaster spray equipment. The substrate must be clean and pre-wetted immediately before application; apply 2 – 25 mm in a single coat and smoothen the surface with a straight-edge tool.
Curing
As a cementitious material, KingPlast WR100 should be cured in the same manner as cement. Protect the fresh plaster from rapid drying, direct sunlight and wind, and water-cure 2 – 3 times per day during the first days after application. Because water repellency is integral to the plaster, no additional external water-repellent treatment is required to control efflorescence.
Cleaning
Clean all tools with fresh water immediately after use. Hardened material must be removed mechanically.
Coverage, packaging and storage
Yield
Approximately 14.5 – 15.5 litres of mortar per 25 kg bag.
Packaging
KingPlast WR100 is available in 25 kg bags.
Storage
Shelf life is 12 months when stored unopened under cover, in cool, dry conditions, out of direct sunlight and protected from moisture and from extremes of temperature. Failure to comply with the recommended storage conditions may result in premature deterioration of the product or packaging. For specific storage advice, consult KingKrete’s Technical Services Department.
Health and safety
As with all chemical products, care should be taken during use and storage to avoid contact with the eyes, mouth, skin and foodstuffs. Avoid inhalation of dust and wear suitable dust protection when handling. Treat any splashes to the eyes and skin immediately; if accidentally ingested, seek medical attention. Reseal containers after use and use in well-ventilated areas.