Overview
Cuprinol Ultra Tough Wood Filler is a solvent-based, quick-drying, two-part wood filler. It is ideal for repairing decayed wood after treatment with Cuprinol Ultimate Repair Wood Hardener or for general-purpose filling of cracks, splits, and nail holes in both interior and exterior joinery. This tough and durable formula effectively repairs damage caused by wet rot and is perfect for major joinery repairs.
It can be used on bare wood before varnishing, painting, or staining and is suitable for both indoor and outdoor applications, such as filling knot holes, screw holes, and nail holes in furniture, paneling, and other sound wood surfaces. The filler hardens through a chemical reaction, setting quickly without shrinking. Once dry, it becomes weather-resistant, adheres well to wood, and can be sanded, drilled, screwed, nailed, or further filled as needed
This product is designed for Professional Use only.
Features
- Tough and durable, weather resistant 2-part wood filler
- Ideal for repairing damage caused by wet rot
Usage Guide
Prepare
Identify the full extent of any decay by probing the wood with a sharp instrument. Cut out all badly decayed and very soft wood. Remove paint, varnish, dirt or loose material from the area for repair and immediately around it for about 25-50mm (1-2 inches). If wood is wet, allow it to dry thoroughly before using Cuprinol Ultimate Repair Wood Hardener (see separate Cuprinol Datasheet) and Cuprinol Ultra Tough Wood Filler. For best results, pre-treat the repair area with an appropriate Cuprinol wood preserver and allow it to dry. Ensure the chosen colour is the nearest match to the wood being filled.
TIP: to obtain better anchorage of the Wood Filler in deep holes (greater than 25mm or 1 inch), fix screws into the bottom of the holes leaving the heads and stems exposed inside the holes
Apply
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 in uniform. NB. 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 30 Minutes under normal conditions. Smooth to the required contours using sandpaper or file. The repair can then be finished with either a paint or wood stain. (A slight tackiness may occur on the surface, but this will not affect smoothing down, painting or staining).
Tip: the filler will accept paints and wood stains such as Cuprinol and Dulux Trade Woodstains, 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 the satisfaction before proceeding.
Dry
Workable for up to 10 minutes and dries within 30 minutes. This time may vary dependent on the weather conditions and the depth of the hole being filled.
Clean
Store
Replace lid on the catalyst tube and reseal can after use.
Clean up
Remove as much product as possible from application equipment before cleaning. For best results use Polycell* Brush Cleaner. Re-seal can after use.
*Cuprinol and Polycell are both brands from AkzoNobel.