British Gypsum Thistle Bonding Coat Plaster - 25Kg - 4 Bags

Name: British Gypsum Thistle Bonding Coat Plaster - 25Kg - 4 Bags
Brand: British Gypsum
SKU: cgv3ulaemf
Availability: InStock

British Gypsum Thistle Bonding Coat Plaster is a multi-purpose undercoat plaster designed for smoo...

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Product Information

Full details

British Gypsum Thistle Bonding Coat Plaster is an ideal solution for plasterers and contractors working on low-suction or smooth surfaces like concrete and dense blockwork. It offers a high-performance undercoat that ensures a stable, level base for final finishes, though it requires careful management of water ratios during mixing to achieve the ideal consistency.

All features

Brand	British Gypsum

Extended Product Information

FAQs

Can I use this on plasterboard?

Yes, it is designed to be suitable for plasterboard surfaces as well as dense blockwork and concrete.

How much water do I need per bag?

Always follow the water ratios specified on the individual packaging as they are optimized for the specific batch mix.

Is this a finishing plaster?

No, this is an undercoat plaster meant to provide a base for a final finishing plaster coat.

What is the primary benefit of the vermiculite additive?

The exfoliated vermiculite makes the product lightweight and significantly improves its workability and spreading consistency.

Can I use it on high-suction backgrounds?

It is specifically formulated for low-suction surfaces; for high-suction backgrounds, you may need to apply a control measure or primer first.

Troubleshooting

Plaster is cracking after drying

Ensure the background is not too dry or porous; dampen the substrate slightly before application if necessary to prevent rapid water loss.

Mixture feels too stiff or heavy

Add small amounts of water gradually while mixing; avoid adding excessive water at once to maintain structural integrity.

Plaster falling off the wall during application

Check the background for dust or loose particles and ensure it is not too smooth; consider a bonding agent or scratch coat if the surface is exceptionally non-porous.

Pros and Cons

Pros

Superior adhesion on smooth, low-suction backgrounds
High workability for easier leveling and darbying
Reliable, consistent pre-mixed composition
Suitable for a wide range of masonry and concrete surfaces

Cons

Requires careful water measurement for proper consistency
Heavier lifting due to 25kg bag weight
Not suitable for high-suction backgrounds without preparation

Setup, Compatibility & Care

Surface Preparation: Ensure all backgrounds are clean, dry, and free from loose debris, dust, or oils that could impede adhesion.
Mixing: Use a clean mixing bucket and a mechanical mixer. Add the powder to clean, cool water gradually, mixing until a smooth, lump-free consistency is achieved.
Application: Apply the plaster using a steel float. Spread evenly and rule off to the desired thickness.
Compatibility: Compatible with most standard British Gypsum finishing plasters. Do not apply over surfaces that are excessively wet or covered in sealers unless recommended.
Storage: Keep bags in a cool, dry environment, stored off the floor on pallets to prevent moisture ingress, which can harden the product inside the bag.