Cuprinol Ultra Tough Wood Filler

SKU: 5092525
Cuprinol Ultra Tough Wood Filler - High Performance 2 Part - Natural Colour
Cuprinol Ultra Tough Wood Filler - Natural - 500 Gram
Cuprinol Ultra Tough Wood Filler - Natural - 750 Gram

Cuprinol Ultra Tough Wood Filler

SKU: 5092525
Regular price £11.87
Tax included.

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Cuprinol Ultra Tough Wood Filler is formulated to repair damage caused by wet rot and most major joinery repairs. It can be used indoors or outdoors on furniture, panelling, window frames and much more. It can be used to fill knot holes, screw and nail holes. It is fast setting, non-shrinking, weather resistant with good adhesion to sound wood. It can be sanded, filled, drilled, screwed and nailed when dry. Use Cuprinol Ultra Tough Wood Filler before varnishing, painting or staining bare wood.

  • Gives long lasting weather resistant repair
  • Can be screwed, sanded, filled and painted
  • Resists shrinking, splitting and cracking
  • Fills holes of any size or depth (under normal conditions)
  • Solvent based

  • Area Interior and exterior
    Recommended Use All major joinery repairs
    Base Solvent-Based
    VOC Levels Medium


    Always ensure the surface to be treated is clean, dry and free from any dust, algae, fungi or moss.

  • To clean wood give it a good brush with a stiff brush to remove any dirt, debris or loose wood
  • If your wood has been effected by algae, fungi or moss this must be removed and can be cleaned with products such as Cuprinol Decking Cleaner or Cuprinol Garden Furniture Cleaner
  • Cut away decayed and very soft wood back to a sound base
  • Allow wet wood to dry thoroughly before application
  • For best results treat area with Cuprinol Wood Preserver

  • Application

    Before applying stir the product thoroughly and test a small area to ensure adhesion.

  • Only mix an amount of Cuprinol Ultra Tough Wood Filler that can be used within 10 minutes
  • Using a hard surface such as the plastic lid of the container or a wooden board, mix the filler and catalyst paste with a spatula or putty knife in the proportions of a golf ball size of filler to 40mm (1.5 inch) thread of catalyst paste from the tube
  • Mix thoroughly until no streaks remain and the colour is uniform
  • Adding too much catalyst will cause the filler to become very hot, to dry very quickly, and affect its performance
  • Apply a thin coat of mixed filler to the repair, pressing well in to get good adhesion
  • Immediately fill in the remainder of the hole, leaving slightly proud for smoothing down
  • Allow to set hard, this takes about 30 minutes under normal conditions
  • Smooth to the required contours using sandpaper or file
  • Apply only in dry conditions, above 5°C and when bad weather is not forecast
  • Note: Always follow the manufacturer instructions found on the tin.

    Aftercare & Storage

    The repair can then be finished with either a paint or woodstain. The filler will accept paints and woodstains such as Cuprinol Garden Shades or Cuprinol Garden Furniture Stain. Although the degree to which it may show through will be influenced by the preparation, the nature and characteristics of the wood as well as the type and application of the wood stain. Try a test area to ensure satisfaction before proceeding.


    All orders placed on a working day before 3pm will be dispatched on the same day for next working day delivery. Orders placed before 3pm on Friday will be delivered on Monday (excluding bank holidays). Orders placed on weekends and Bank Holidays will be dispatched on the next working day.

    Delivery Charges 


    Next Working Day




    We do not deliver to the Channel Islands or the Republic of Ireland

    Certain postcodes delivery times and charges may vary please see our list below of effected postcodes. Please contact us prior to ordering if you have any queries regarding delivery times .

    AB31 - AB38

    KA27 - KA28

    PH4 - PH44

    AB40 - AB56

    KW (All postcodes)

    PH49 - PH50

    BT (All postcodes)

    LA15 - LA23

    PO30 - PO41

    CA18 - CA57

    PA20 - PA38


    HS (All postcodes)

    PA41 - PA49

     TR21 - TR25

    Isle of Man (All IM postcodes)

    PA60 - PA78


     ZE (All postcodes)

    IV (All postcodes)

    PA80 - PA88








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    We offer a no quibble 14 day money back guarantee for all goods shipped correctly that are not required. If the item is not required, please send the item back for a full refund in its original condition, unused with its original packaging. 

    We keep the process simple

    • Contact us as soon as possible to inform us you will be returning the product.
    • Please include the original packing slip in the box, if this is unavailable please include a slip with your order number and name.
    • Package the goods well to ensure they arrive back undamaged, we recommend using the original packing it was sent in if this is still usable.
    • Return to our address:
    Unit 20 
    Adlington Business Park
    SK10 4NL

    Return postage will be at your own cost. We always advise you send parcels with a tracked service as we cannot be held responsible for any loses/damages in transit. We recommend using a courier site such as Parcel Monkey. Once goods are received they will be checked and processed within 3-5 days and you will receive a notification of refund.

    Please note any bespoke items or mixed to order can not be returned, if you are unsure this is your product please check the listing or contact us for details.
    We always recommend getting samples or contacting us for free of charge colourcharts. We do our best to represent colours as accurately as possible however screens variations and different surfaces can alter this. Unfortunately in the event you do not like the colour we are unable to accept the product back if they it has been opened.

    Damaged Paint

    Please visit our damages page where we can help resolve the issue for you. 

    Incorrect Item

    We will be happy to organise an exchange for the correct goods at no extra charge to yourself, please call us to organise this.

    Faulty Items

    If you find a fault with your product, we can offer a full refund or exchange within 30 days. We test every product that is returned to us, sadly if a product is found to have no fault we cannot refund this and the you will be given the option to have this returned to you. Please contact us to discuss these options. If you find fault after 30 days of purchase you may wish to contact the manufacturer directly as they will be able to offer support with the product.



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