Cornerstone Promix Medium Topcoat Plaster is a dry ready mixed render and plaster designed for internal and external finish render coats within an appropriate render system. It is manufactured using 100% pure natural hydraulic lime, natural sands, and conservation-appropriate additives to create a high-performance render and plaster that withstands high-traffic areas or outdoor elements.
Promix Medium Topcoat Plaster offers enhanced plasticity, which improves adhesion and decreases likelihood of slump. Moreover, thier longer open time makes this lime render undemanding to apply, level, and finish. Promix topcoat is vapour permeable and improves moisture management in a building.
Part of the trusted Cornerstone Promix range, Cornerstone Promix Medium Topcoat can be used as a lime render or plaster for a wide variety of construction, renovation and conservation projects. The product is supplied as standard with Saint-Astier® NHL2, although alternative binders and mix ratios are available upon request to meet specific project requirements.
Promix Medium Topcoat Render is ideal for creating external finish render coats and internal decorative finishes where a natural and traditional aesthetic is desired. When floated with a plastic or wooden float, it provides an attractive light tan finish with a medium texture. Alternatively, sponging the surface produces a smoother yet moderately textured finish, offering flexibility in appearance depending on project requirements.
Key Features
- Premium Lime Render and Plaster: High-quality hydraulic lime render and plaster designed for internal and external finish applications.
- Dry Ready Mixed Formula: Medium Topcoat is a dry ready mixed render and plaster designed for consistent performance and ease of use.
- Natural Hydraulic Lime Composition: Manufactured using natural hydraulic lime, natural sands and carefully selected additives.
- Attractive Light Tan Finish: Provides an attractive light tan finish with a medium texture when floated.
- Traditional Medium Texture: Creates a traditional medium texture and refined appearance suitable for heritage and contemporary projects.
- Multiple Finishing Options: Can be floated with a plastic or wooden float for a medium textured finish or sponged for a smoother yet moderately textured finish.
- Breathable Construction Solution: Supports moisture management while maintaining the benefits of traditional lime construction.
- Promix medium topcoat lime plaster is a premium dry ready mixed natural Hydralic lime mortar for plastering and rendering.
- Supplied in 25Kg bag. One bag yields approx. 15 litres
- Manufactured using 100% pure natural hydraulic lime and selected natural sands.
- Creates an attractive light tan finish with a medium textured appearance.
- Suitable for use within appropriate internal and external render systems.
| Product Type | Medium Topcoat plaster / Render |
| Product code | Promix |
| Yield | A 25kg bag yields approx. 15 litres |
| Materials | Natural Hydraulic Lime, Natural Sands, Additives |
| Coverage | A 25kg bag covers approx. 1.9m2 at 7mm thickness |
| Fire Rating | A1 |
| Colour | Tan |
| Coat | Topcoat |
| Order Value | Delivery Charges (Excluding VAT) |
|---|---|
| 1-10 | £30 across the Mainland UK |
| 11-20 | £50 across the Mainland UK |
| Pallet Charges apply Thereafter | |
Returns/Refunds And Cancellations:
- You can cancel your order and get a full refund anytime before we confirm your order via email.
- Orders cancelled after the order confirmation is sent may attract a restocking fee.
- If you want to return insulation that was ordered in excess or not of use anymore, you can return them within 14 days from the date of receipt, provided they are unused and in a resalable condition. Please contact us via email and we will assist you accordingly.
- If the product is damaged on receipt, email us immediately
For more information on returns and deliveries, please refer to our delivery information page.

