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Extratime Plaster Retarder

Extratime Plaster Retarder is a great way to get more precious time plastering. Add this to your plastering mix and get up to an extra hour to work your plaster before it goes off.

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Availability: In stock

Product Name Price Qty
Extratime Plaster Retarder (1 Sachet)
Extratime Plaster Retarder (5 Sachets)
Extratime Plaster Retarder (10 Sachets)
Extratime Plaster Retarder (20 Sachets)
Extratime Plaster Retarder (50 Sachets)

Extratime Plaster Retarder

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 What is Extratime Plaster Retarder?

Extratime is a chemical additive for use with finishing plasters. The additive slows the curing process of the plaster by slowing the chemical crystal formation that causes the gypsum plaster to set or harden. Extratime is recommended for moderate lenthening of finishing plaster setting times. Extratime will lengthen the setting time by 30-60 minutes depending on the ambient temperature and relative humidity of the environment.

Extratime has been developed by a plasterer with over 20 years experience in the trade to allow more time to complete larger areas. It is ideal for ceilings and large walls.

"After years of being under pressure when working on large ceilings and walls I thought there must be some way of making the job easier. I set out to develop something that was easy to use, inexpensive and provided a little more time - The result was Extratime" M Shepherd, Founder, Eazymix Ltd.

Extratime can be used with all finishing plasters. It helps make plastering easier especially when working on large areas or in hot weather. It simply takes the pressure off.


Extratime Plaster Retarder User Instructions:

5 simple steps for extending plaster setting times by up to 60 minutes:

  1. Pour clean fresh water into a mixing bucket
  2. Open Extratime sachet and whisk thoroughly
  3. Gradually add plaster and whisk thoroughly
  4. Continue adding and whisking plaster until smooth, lump free and it reaches the desired consistency 
  5. Apply exactly as normal plaster and enjoy up to 60 minutes extra time before the plaster sets.

Extratime is suitable for use with all finishing plasters. The following products are all suitable:

  • British Gypsum Thistle Multi Finish Plaster
  • British Gypsum Thistle Finishing Plaster 
  • Thistle Board Finishing Plaster
  • Thistle Multi-Finish Plaster


  • Do not add directly to the plaster mix.
  • Avoid direct contact with eyes and skin.
  • Wear eye protection, protective gloves, long-sleeved clothing and trousers to prevent direct contact.
  • If eye contact occurs, immediately flush thoroughly with water for 30 minutes and seek immediate medical advice.
  • Wash thoroughly with soap and water after use.
  • Do not ingest. If ingested, seek medical advice immediately.
  • Once opened use within 48 hours. For best before date see individual sachet.

Reviews of Extratime Plaster Retarder

Andy, Professional Plasterer, Burnley

"Amazing product, just what I needed on a job that would normally have required 2 men. Did an 18sqm wall single handedly without any drying issues. Easy to use and great results. "

Matt, DIYer , Harrogate

"I used Extratime to help with plastering a small wall - it worked great allowing me to take my time with the finishing."


We deliver throughout the UK and standard delivery times are 2-5 working days. We try to exceed this delivery time wherever we can. We also offer a express delivery service when available giving a next working day service if ordered before 1 pm (10 am for Eco Solutions products). Confirmation of delivery will be made on receipt of the order. 

We will always try to exceed our stated delivery times where possible or dispatch orders for delivery on the next working day after our cut-off whenever possible. 

Our returns policy allows you to return any item if it is not what you require within 14 days of receipt. This is as long as it has not been used and is returned in its original undamaged packaging.


The DIY Doctor store is open and available for delivery orders.

Our range of products is reduced to focus on products that are essential, or safe to pick and dispatch. 

Delivery times will be extended by up to 5-7 days as we deal with orders while following government distancing guidelines. 

Bank Holidays

We do experience an increase in orders over Bank holidays which can lead to delays in processing orders. We will endeavour to dispatch all orders as quickly as possible. If there are any potential delays we will contact you directly to inform you.

Free Delivery:

Where products have been quoted as having free delivery or delivery included, this will not apply for Northern Ireland and the Highlands and Islands due to the excess delivery charges incurred reaching these locations. Delivery costs can be seen by entering your postcode into the basket. 

Why do we charge delivery?

A great many of our customers purchase multiple products, so if we build the delivery charges into each item we will in effect be charging delivery on every product in their basket. We think it is fairer to charge a single delivery cost for the contents of the whole basket once. Some products do have delivery included; this is typically because they are dispatched from another location, generally direct from the manufacturer, as there are restrictions to how they can be delivered due to their size, or if they are liquids, for example.

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