What is Knot Filler?


Wood is a natural material, and each piece is unique—often with knots, splinters, or cracks that can be challenging to repair. Knot filler provides a fast, durable, and simple solution to repair such damage in a single application.

Developed in collaboration with the wood industry

Developed in collaboration with the wood industry, Knot Filler enables effective repair of knots, cracks, splinters, and other larger defects in wood. It delivers strong, flexible, and long-lasting results on all types of wooden surfaces, including floors, furniture, and windows. Ideal both for quick on-site repairs and for continuous production processes.

Fast curing
Strong and elastic
No shrinkage
Water-resistant

How to use it

Perfect repairs in only 3 Steps!


Compatible with almost all surface treatments

Can be used with almost all types of finishes and surface coatings, e.g. conversion varnishes, solvent- and water-based polyurethanes, solvent- and water-based UV lacquers, aluminum oxide coatings, varnishes, acrylic, latex, and enamel paints.


Where is Knot Filler used – and why?

Flooring and Furniture Industry

Preferred by producers for its extremely fast application process and outstanding durability. Knot Filler also meets and has integrated the highest standards for quality, health, and environmental compliance.


Window and Door Industry

Fully implemented by manufacturers due to its flexibility and durability. Knot Filler follows the wood’s natural movement over time and remains unaffected by weather and wear, even in variable climates.
The Woodworker

Ideal for anyone who wants to make quick, easy, and long-lasting wood repairs. Often discovered as a “let’s try it” product in building supply stores, Knot Filler quickly becomes a permanent tool at the workbench once used.

Knot Filler is the professional choice for very fast, strong, durable, and highly flexible repairs of larger wood defects prior to finishing. Most other wood fillers are designed for cosmetic wood repairs such as small nail holes, fine cracks, and surface scratches. It is easy to apply and ideal for minor touch-ups, but way less durable, time-consuming and unsuitable for large or structurally difficult repairs, unless toxic or reactive chemicals are added, such as in the classical 2K products.

Extremely durable and flexible
Can be sanded and finished
Super adhesion
Minimal waste

related

Wood Repair PRO Kit
When you need to repair knots, cracks, or small damages in wood, the PRO Kit provides a complete solution that makes the work both easy and efficient. The kit contains everything you need, including the professional BCD360 Knot Filler Gun, which is specifically designed for this purpose. The gun ensures an even and precise application of the knot filler, which melts and is applied directly into the damaged area. The filler bonds effectively to the wood, hardens quickly, and provides a strong and flexible repair that can withstand the natural movements of the wood without cracking. Once the repair has cooled, the surface can be easily sanded and finished with oil, varnish, or paint, resulting in a neat and durable finish. The PRO Kit is suitable for professionals who want a high-quality result with minimal effort. It is the ideal solution for repairing wood quickly, safely, and with a long-lasting finish. PRODUCT INFO:   Content1x bag of Knot Filler, Colors: MIX bag w. 2x Pine, 2x Oak, 2x Walnut, 2x Black (8 sticks of 300mm, Ø12mm)1x BCD 360 Knot Filler gun with adjustable thermostat1x Cooling iron (180x80mm)1x Cooling brick (50x50mm)1x Cutting tool1x Knot Filler SaverManual and colour chart Our recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   Plastic case  

Water resistant

E850 Floor Filler
E850 is a special paste filler specifically developed for full-trowel filling of parquet flooring. E850 has a particularly unique and fine-grained texture, which makes it easy to cover knots, cracks, holes, and other imperfections in wooden floors. With E850 only one application is necessary. Excess filler is easy to remove with a sanding machine and it only creates a small amount of dust. E850 accepts all kinds of surface treatments, however it is not urgent to use finishes as the paste filler is water repellent when hardened.  PRODUCT INFO:  ♦   Very high quality  ♦   Water repellent   ♦   Fine-grained consistency ♦   Perfect for parquet floors   ♦   Only 1 application necessary ♦   Minimal dust when sanding   ♦   Free of any toxic   ♦   Ready to use ♦   Perfect for mosaik etc   ♦   Perfect for both outdoor and indoor repairsOur recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   7kg bucket See Data Sheet here
Wood Repair PLUS+ Kit
This complete PLUS+ repair kit is perfect for window and floor installers, carpenters, DIY enthusiasts, and anyone needing to repair damage, knots, cracks, etc., in wood and wood surfaces. The PLUS+ wood repair kit includes everything needed to make perfect repairs with Knot Filler.  Product info:  Content:1x WR 180 Knot Filler Gun1x bag Mix 1 Knot Filler (8 sticks × 150 mm, Ø 12 mm) in colours: Knot, Pine, Oak and Mahogany1x bag Mix 2 Knot Filler (8 sticks × 150 mm, Ø 12 mm) in colours: Ash, Beech, Walnut, Black2x Cooling Brick, 50 × 50 mm1x Cutting Tool, 50 mm1x Knot Filler Colour ChangerBCD 180 Knot Filler Gun FeaturesOn/Off SwitchPrecise control with the on/off function provides safe and simple operation. The gun can remain plugged in between tasks – just switch it off when not in use.Power Indicator LightA clear LED light shows when the gun is switched on and heating up, providing increased safety and optimal operational control.Constant TemperatureOperates at a steady 190 °C for fast and efficient application.Replaceable NozzleThe nozzle can be changed when needed or if a different outlet size is required. Our standard nozzles are Ø1.5 mm, 3 mm, and 4 mm.Compatible with Ø12 mm Knot Filler SticksFits Ø12 mm Wood Repair Knot Filler sticks for optimal performance and the best results.Technical Data:Dimensions: 220 x 170 x 35 mmWeight: 250 gPre-set operating temperature: 190°COperating voltage: 220–240 VAC, 50–60 HzPower consumption: 80 WHeating time: approx. 7 minutesReplaceable nozzleOur recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING: Delivered in an FSC®-certified cardboard box, which can be reused for storage or disposed of as paper waste. 
Wood Filler
Wood Filler is a traditional paste filler with a fine-grained consistency, which makes it easy to use. Wood Filler is an economic alternative to other paste fillers and is suitable for repairing knots, cracks etc. It is used in many different wood industries/segments.  PRODUCT INFO:  ♦   Traditional paste filler   ♦   Fine-grained consistency   ♦   Several colors    ♦   Ready-to-use   ♦   Drying time depends on the size/depth of the repair ♦   Not water-repellent, needs surface treatment to seal the repair.Our recommendation Our wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   400g bucket or 9 kg bucket

Water resistant

KNOT FILLER (150 mm)
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.  PRODUCT INFO: Ready-to-useDurableHardens in sekundsStays in the woodMinimal wasteNo toxicsStrongFleksible - works with the woodMany colorsPerfect for all types of woodCan handle temperature changesFor indoor and outdoor useAccepts all kinds of surface treatmentsPerfect for repairs in formwork panelsZip-lock bags PACKAGING:  •   COMPACT BAGS:   8 sticks of 150 mm (Ø12mm) •   Compact bags close with zip-lock •   Knot Filler is included in the Wood Repair Basic Kit and Wood Repair PLUS+ KitOur recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use.Solvent-freeThe product contains no intentionally added organic solvents and cures by cooling rather than solvent evaporation.Always use the product according to the instructions.See Data Sheet here

Water resistant

KNOT FILLER
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 both water-repellent and flexible, which also makes it perfect for outdoor use. It is a non-toxic product, safe for the user and environment.  PRODUCT INFO: Ready to use  Excellent adhesion    Hardens in seconds Does not fall out    Minimal waste  No toxins Strong    Flexible – works with the wood Many colors Perfect for all types of wood    Resistant to temperature changes    Perfect for formwork   Indoor + outdoor use    Accepts all types of finishing Our recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   INDUSTRY BAGS:  9 sticks of 300 mm (Ø12mm) •   Knot Filler is included in the Wood Repair Pro Kit & Wood Repair Battery KitSolvent-freeThe product contains no intentionally added organic solvents and cures by cooling rather than solvent evaporation.Always use the product according to the instructions.See Data Sheet here
Powder Filler
Powder Filler is an organic paste filler of very high quality. The paste filler comes as powder which is easily mixed with water (3 parts powder, 1 part water) to obtain a high quality paste filler. Just mix the amount of paste filler you need. Powder Filler is perfect for repairs with a depth up to 15 mm and it can handle both stain and brushing. Powder Filler comes in three different qualities/types (contact us for more info).  PRODUKTINFO:  ♦   Mixing ratio: 3 parts powder, 1 part water   ♦   Very high quality ♦   100% organic product   ♦   Suitable for repairs with a depth up to 15 mm ♦   Extra strong paste filler - can handle brushing   ♦   Mix colours as you please ♦   Accepts all surface treatments   ♦   Perfect for all kinds of wood     ♦   Perfect for knots, cracks etc.   ♦   3 different qualities/types   ♦   Possible to add pigment  ♦   Drying time depends on the individual size of the repair ♦   Add Powder Hardener to get an extra strong paste fillerOur recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   20 kg buckets See Data Sheet here

New

Wood Repair PRO Cordless Kit
The Wood Repair PRO Cordless Kit contains everything needed for professional wood repair.This complete Wood Repair PRO Cordless Kit is designed for professionals in the wood industry who work with repairing knots, cracks, and other damage in wood surfaces. The kit ensures efficient and precise wood repair – both in production and on-site.The WR 540 is specially developed for use with Knot Filler and ensures a consistent and reliable application. The gun uses a flexible adapter system, allowing you to use your preferred battery brand – a both economical and more sustainable solution. Product information:  Includes: 1x WR 540 PRO Cordless Knot Filler Gun1x bag of Knot Filler Mix (8 sticks of 300 mm, Ø12 mm) in the colors: Pine, Oak, Walnut, Black.1x Cooling Brick 50x50mm1x Cooling Iron1x Cutting Tool 50mm1x Knot Filler SaverWR 540 PRO Cordless Knot Filler Gun Features:“Battery-powered Knot Filler GunFreedom to work without a cord. The battery-powered function provides maximum mobility and makes it easy to carry out repairs anywhere.Adjustable temperature dial (100–210°C)Easily adjust the temperature to suit your repair needs. The rotary dial provides precise control and flexibility for different wood types and filling tasks.Automatic shut-off to prevent battery drainPrevents battery drain by automatically switching off the gun when it is not in use. This ensures longer operating time and helps protect the battery.Replaceable nozzleReplaceable insulated nozzle Replace it when the nozzle is worn or if you want a different size. Ergonomic trigger and non-slip gripDesigned for comfort and precision. The ergonomic trigger reduces fatigue during extended use, while the non-slip grip ensures full control during repairs.Green light when ready for useEt green indicator light clearly shows when the gun is ready for use, so you always work safely and efficiently. Heating time approx. 5 minutesReady for use in just approx. 5 minutes, enabling fast and efficient work without waiting time.Technical data: Lightweight model for Ø12 mm sticksDimensions: L 280 x H 226 x W 72 mmWeight: 595 g Operating voltage standard battery: 18V 2.0Ah Power consumption: 200W Operating time depends on the battery size/capacity.Compatible with Dewalt, Makita, Milwaukee and Bosch adapters.Our recommendationOur Wood Repair products consist of different materials with varying properties and reactions to surface treatments. Although we continuously test our products, we cannot guarantee adhesion or performance in all situations. As the quality of the wood and surface treatments may vary, and changing weather conditions can affect the finished repair, we always recommend performing individual tests of adhesion and suitability before using the product. Packaging: Supplied in an FSC®-certified cardboard box, which can be reused for storage or disposed of as cardboard waste.

Water resistant

Knot Filler Granulate
Knot Filler Granulate is perfect for repairing wood with semi- and full automatic machinery. It is the same unique quality as our Knot Filler sticks. Knot Filler Granulate is particularly good for parquet productions where machinery is used for filling and repairing knots, cracks, etc. in floorboards. Knot Filler Granulate is also suitable for smaller tank systems such as the TR55 Granulate gun which is often used for repairs in formwork panels.  PRODUCT INFO:  ♦   Ready-to-use   ♦   Durable   ♦   Hardens in seconds   ♦   Stays in the wood ♦   Perfect for repairs in wood and formwork   ♦   Accepts all kinds of surface treatments ♦   Perfect for semi- and full automatic machines   ♦   No toxics   ♦   Many colors ♦   Perfect for tank systems, e.g. filling machines from Wintersteiger ♦   Can handle temperature changes   ♦   For indoor and outdoor use ♦   Three types of hardnesses (contact us for more info)Our recommendationOur wood repair products consist of different materials with varying features and surface treatment reactions. Although we carry out regular testing, we cannot guarantee adhesion or performance in every situation. As the quality of wood and surface treatments can vary, and changing weather conditions can influence the finished repair, we always recommend carrying out individual adhesion and suitability tests before use. PACKAGING:  •   20 kg sacks