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Knot Filler Thermelt Industrial Bags

Original price $88.00 - Original price $88.00
Original price
$88.00 - $88.00
Current price $88.00
Availability: LOW STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: LOW STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: IN STOCK
Availability: LOW STOCK
Availability: IN STOCK
Availability: IN STOCK
Choose a Colour

The ORIGINAL Knot Filler in industrial sized sticks..

Knot Filler is a unique product for repairing all kinds of knots, cracks, splits, defects etc. in wood. It is easy and quick to use, durable, flexible and strong at the same time. Knot Filler is water-repellent, which also makes it perfect for outdoor use. It is a non-toxic product, safe for the user and environment.

How does it work?
Using Knot Filler is easy:

  1. Put a Knot Filler stick in the Knot Filler gun and turn it on
  2. When the gun is warm, apply Knot Filler into the repair
  3. Be fast when applying the Knot Filler
  4. Place a cooling iron/block on the Knot Filler quickly after application
  5. Remove excess Knot Filler with a cutting tool when the Knot Filler has cooled off and has an even-coloured surface
  6. Sand the repair - by hand or machine
  7. Apply surface treatment - after sanding Knot Filler accepts all kinds of surface treatments



  •  9 x 300mm Industrial Sticks (Ø12mm)
  • Mix Pack Includes 2 of each x Pine, Oak, Walnut & Black (8 Sticks)
Please note: The compact sticks are designed for the smaller BCD180/Basic/Plus Kits but will still work with the BCD360/Pro Kit however will need to be used in multiples of 2 to reach the feed on the larger gun. We recommend the Industrial sticks be used for the larger gun.

    Kits & Guns sold separately here



    What kind of repairs is Knot Filler suitable for?
    Knot Filler is suitable for all types of softwoods, hardwoods, plywoods and more!
    It is perfect for all kinds of repairs such as knots, cracks, edge repairs, corner repairs, cover-up of screws etc. Knot Filler is also perfect for formwork repairs, and it has become a popular repair material in the formwork industry.

    Why should I use Knot Filler instead of epoxy?
    There are several reasons why Knot Filler is preferable to epoxy:
    1) Knot Filler is non-toxic and therefore does not harm neither the environment nor the user
    2) Knot Filler is a faster way to repair wood
    3) Knot Filler is flexible and works with the wood, thus stays in the wood and does not crack
    4) Knot Filler is ready to use - no mixing
    5) Knot Filler dries in seconds
    6) Knot Filler is UV proof
    7) Knot Filler accepts all kinds of surface treatments after sanding
    8) Knot Filler is suitable for all kinds of repairs, no real limits to the possibilities of repairs with Knot Filler.

    Can I use Knot Filler outside?
    Yes. Knot Filler can be used for both internal and external repairs. Knot Filler has been tried & tested in a variety of climates all over the world!

    Does Knot Filler accept stain, oil, etc?
    Yes. Just be sure to sand the repair first, as this "opens" the repair, so it accepts any kinds of surface treatment.

    How do I change colour?
    There are a few options to choose from in terms of changing Knot Filler colours. We recommend the following:
    1) Use different heating guns for different colours,
    2) Use our Knot Filler Saver to make new smaller Knot Filler sticks of the excess Knot Filler before you get the new colour.
    Note: we highly recommend that you always try to plan your repairs so you make more repairs with the same colour, and thereby minimize colour change.

    Do you have any certifications for Knot Filler?
    Yes, Knot Filler complies with the IKEA test specification IOS-MAT-0054, and has been tested for Bisphenol A, Cadmium, Lead, Organotin, and Phthalates CPSC. Hence, Knot Filler is an environmentally friendly product that does not harm the user nor the environment.

    Why do I get bubbles in my repair?
    There are two possible causes:
    1) The working temperature of the heating gun is too high, which causes the Knot Filler to boil and creates bubbles. It is important to follow the recommended temperature which is noted on the labels of the Knot Filler bags, and adjust the temperature if bubbles occur
    2) If the Knot Filler sticks have been exposed to air over time, it creates moisture in the Knot Filler sticks, which causes bubbles when you apply the Knot Filler. In order to prevent this, it is extremely important to close the Knot Filler bags tightly after use, as noted on the labels on the bags.

    Does Knot Filler sink?
    No. Knot Filler does not sink when it is applied correctly. Hence, when you shoot the Knot Filler into the repair, let it cool down for a while, before you cut off the excess part, you will see a perfect repair. One of the big advantages with Knot Filler is that it does not sink over time. Temperature differences can though affect Knot Filler as it affects all other things. Therefore, Knot Filler might expand a bit in warm temperatures, whereas it might shrink a bit in cold temperatures when it is first applied. From our experience, the reaction does mostly occur in large-size repairs and does not occur in standard repairs. Another advantage of Knot Filler is that you can see the result of your repair instantly. It will not change character or sink later on the surface where it’s applied.

    Can I sand the repair and what is the best technique?
    When you have filled and cut the repair it is ready to be sanded. Sanding the repair is important as it ensures that the repair accepts the surface treatment you wish to use. It does not matter whether it is oil, stain, lacquer, paint - you can use any surface treatment you want, as long as you sand the repair first. The best technique is to sand the wood 90% prior to starting to repair the wood. When you have filled the repair with Knot Filler and cut off excess you finish the last 10% of the sanding process. Make sure to use a good flow when you sand the wood and the repair, in order to let the repair "breathe" while being sanded.

    What is the best way to repair a long and deep crack / damage?
    1) Sand the wood 90-95% finish before you start to repair with Knot Filler
    2) Fill the repair 2/3 with Knot Filler leaving the last 1/3 top without filler until it has dried
    3) when the Knot Filler is dry, you fill the last 1/3 of the damage, cools it down with a cooling iron, cut off excess knot filler and sand the repair.

    Can Knot Filler be applied by machine?
    Yes. Knot Filler in granulate form is perfect for semi- and fully automatic machinery. We have had positive experience with both semi- and full automatic machinery from Wintersteiger, and both types of machinery work perfectly with our Knot Filler and produce beautiful repair results.

    Can Knot Filler be used with industrial sanding machines?
    Yes. Knot Filler is perfectly suitable for repairs that are sanded with both hand operated sanders & industrial machinery. The best and most professional results with Knot Filler are achieved with industrial sanding machines such as wide-belt sanders, however hand operated sanding machines are also perfect for Knot Filler repairs.

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