British Gypsum Thistle Hardwall Plaster - 25kg - 5 Pack
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HomebaseBritish Gypsum Thistle Hardwall Plaster 25Kg 5 Pack
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Product Information
Full details
British Gypsum Thistle Hardwall Plaster is a robust undercoat plaster specifically formulated for professional builders and DIY enthusiasts working on medium to high suction masonry backgrounds like brick and aircrete blocks. The primary benefit is its high-impact resistance and rapid setting time, which provides a reliable foundation for finishing plasters, though users should note it requires careful substrate preparation to ensure optimal adhesion.
All features
| Brand | British Gypsum |
|---|
Extended Product Information
FAQs
Can I use Hardwall on top of existing plaster?
No, it is specifically designed for masonry backgrounds. It is not suitable for application over existing gypsum plaster.
How thick should the application be?
It is typically applied in a single coat to a thickness of 11mm, though this can vary based on the requirements of the specific project.
Is this a final finish plaster?
No, this is an undercoat plaster. It must be finished with a final layer of thistle finishing plaster for a smooth surface.
What is the shelf life of the product?
When stored in a dry, moisture-free environment, the plaster maintains its properties for approximately 3 months.
Does it work on aircrete blocks?
Yes, it is specifically designed for aircrete blocks and other medium to high suction masonry materials.
Troubleshooting
Plaster is cracking while drying
Usually caused by applying to a surface that is too dry or by excessive heat. Dampen the background thoroughly before application.
Plaster is not adhering to the wall
Ensure the surface is free of oils, paint, or excessive dust. Consider using a PVA or bonding agent if the suction is too low.
Pros and Cons
Pros
- Excellent adhesion on difficult suction backgrounds
- Reduces the risk of surface salt staining
- Provides a very strong base for subsequent plaster layers
- Suitable for both hand and machine application
Cons
- Requires proper substrate moisture control to prevent cracking
- Not intended as a final decorative finish
- Heavy bags require careful handling during manual transport
Setup, Compatibility & Care
To prepare for application, ensure that all masonry backgrounds are clean, dry, and free from dust or loose mortar. If the background is extremely porous, apply a suitable bonding agent or dampen the wall as directed. For mixing, add the dry powder to clean water, aiming for a consistent, workable paste. Always use clean tools to prevent premature setting. Store the 25kg bags in a cool, dry area off the ground to protect the gypsum from moisture exposure, which can cause the product to harden inside the bag.
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