Thistle plaster

Quick Answer: British Gypsum Multi-Finish is an all-purpose finishing plaster suitable for most backgrounds (plasterboard, undercoats, brick), whilst Board Finish is specifically formulated for plasterboard only. Multi-Finish has a slightly longer working time (90-120 minutes) compared to Board Finish (80-90 minutes), but both produce a smooth, high-quality surface. For most domestic jobs, Multi-Finish offers greater versatility at a similar price point of £8-£11 per 25kg bag. Understanding British Gypsum’s Thistle Range When you’re standing in the plaster aisle at Wickes or Screwfix, the choice between British Gypsum’s Thistle Multi-Finish and Board Finish can seem confusing. Both are finishing plasters, both come in the familiar pink bags, and both promise a smooth surface. The truth is that whilst these products share similarities, they’re formulated for different applications. Choosing the wrong one won’t necessarily ruin your job, but understanding the differences will help you work more efficiently and achieve better results. British Gypsum has been manufacturing gypsum-based building materials since 1917, and their Thistle range remains the industry standard in the UK. Both Multi-Finish and Board Finish conform to BS EN 13279-1:2008, the British Standard for gypsum binders and gypsum plasters. What Is Thistle Multi-Finish Plaster? Thistle Multi-Finish is a universal finishing plaster designed to work on a variety of backgrounds. It’s the go-to choice for professional plasterers because it offers flexibility across different substrates. Key Characteristics of Multi-Finish Substrate compatibility: Works on plasterboard, Thistle undercoats (Browning, Bonding, Hardwall), blockwork, and brick Working time: 90-120 minutes from mixing to setting Setting time: Typically 90-120 minutes Coverage: Approximately 2.5-3m² per 25kg bag at 2mm thickness Skim coat thickness: 2-5mm depending on background Final colour: Light pink when set Multi-Finish contains retarded hemihydrate gypsum plaster with additives that improve workability and adhesion. The formulation allows it to bond effectively to different suction rates, making it forgiving for varying backgrounds. Pro Tip: Multi-Finish’s versatility means you only need to stock one finishing plaster for most jobs. This reduces waste and simplifies inventory management on site. I keep 10-12 bags in the van at all times. What Is Thistle Board Finish Plaster? Thistle Board Finish is a specialist finishing plaster formulated specifically for low-suction backgrounds like plasterboard and Thistle Dri-Coat. Key Characteristics of Board Finish Substrate compatibility: Plasterboard, low-suction backgrounds, Dri-Coat only Working time: 80-90 minutes from mixing to setting Setting time: Typically 80-100 minutes Coverage: Approximately 2.5-3m² per 25kg bag at 2mm thickness Skim coat thickness: 2mm standard Final colour: Light pink when set Board Finish has a slightly faster set time and is formulated to work optimally with the low suction of modern plasterboards. The chemistry is adjusted to ensure proper adhesion without the need for PVA bonding agents (though some plasterers still use them). Side-by-Side Comparison Feature Multi-Finish Board Finish Suitable Backgrounds Plasterboard, undercoats, brick, blockwork Plasterboard and low-suction surfaces only Working Time 90-120 minutes 80-90 minutes Set Time 90-120 minutes 80-100 minutes Coverage (2mm) 2.5-3m² per 25kg bag 2.5-3m² per 25kg bag Price (2026) £8-£11 per 25kg bag £8-£10.50 per 25kg bag Versatility High (all-purpose) Low (specialist use) Drying Time 5-7 days (background dependent) 4-6 days (plasterboard) When to Use Multi-Finish Multi-Finish is your default choice for most plastering projects. Its versatility means you can use it confidently across different backgrounds without worrying about compatibility issues. Ideal Applications for Multi-Finish Mixed-background projects: When you’re skimming both plasterboard and patched areas on walls Re-skim jobs: Going over old plaster or Artex that’s been properly prepared Patch repairs: Finishing over small areas of bonding or browning undercoat Full room re-plasters: Where walls might have brick, block, and board sections Extensions and renovations: Where backgrounds vary throughout the project I’ve used Multi-Finish on hundreds of jobs over the years, and it’s particularly forgiving when you’re learning how to skim coat a wall. The slightly longer working time gives beginners extra minutes to get the trowel work right. Mixing Multi-Finish For a standard 25kg bag of Multi-Finish, you’ll need approximately 11.5-12.5 litres of clean water. Always add plaster to water, never water to plaster. Pour water into a clean bucket (no old plaster residue) Sprinkle plaster evenly into the water Let it stand for 30-60 seconds to soak Mix thoroughly with a paddle mixer until creamy consistency Working time starts from the moment you begin mixing When to Use Board Finish Board Finish is the specialist choice for plasterboard-only projects. If you’re working exclusively on new-build properties where everything is plasterboard, Board Finish offers some advantages. Ideal Applications for Board Finish New-build housing: Where all walls and ceilings are plasterboard throughout Stud wall installations: Fresh plasterboard partitions with no mixed backgrounds Ceiling-only jobs: Skimming plasterboard ceilings High-volume production work: Where the faster set time improves productivity The reality is that Board Finish is less commonly used by general plasterers because most jobs involve at least some mixed backgrounds. However, specialist new-build contractors who work on large housing developments may prefer it. Pro Tip: If you accidentally use Board Finish on a high-suction background like browning undercoat, you’ll notice it sets too quickly and can be difficult to trowel up. Always check the bag label before opening. Performance Differences in Practice On paper, the specifications look similar, but experienced plasterers notice subtle differences in handling and performance. Working Characteristics Multi-Finish: Has a slightly “heavier” feel on the trowel. It stays workable longer, which is excellent for larger areas or when you’re working alone. The extended working time means you’re less likely to rush the second trowel pass. Board Finish: Feels slightly “lighter” and creamier. It starts to firm up faster, which experienced plasterers can exploit to achieve a polished finish more quickly. However, this faster set can catch you out if you’re working large areas solo. Adhesion and Suction Management Multi-Finish is formulated to handle varying suction rates. When you’re working over patched areas or different backgrounds, it adjusts better to inconsistent suction. This is why it’s more forgiving in renovation work. Board Finish assumes consistent, low suction throughout. On properly installed plasterboard, this isn’t an