How to fill the wood pore?


fill wood pore guitar

Covering the pore of the wood of the guitar will be an important and complementary process to varnishing. This will be done with a filler which is diluted with water for its use.

The Nitorlack filler is designed to fill the pore of the wood, especially in woods with open and large pores such as mahogany, ash or rosewood.

With this product we can leave the surface of the guitar smooth for the subsequent application process. In addition, it is also worth mentioning the number of coats of primer that we save, with its respective cost in time and money.

What without this product would mean 4 coats of nitro on an open pore wood, with the pore filler and 1-2 coats of nitro could cover the grain of the wood completely, in half the time.

What uses can we give to the product?

This can be used both to cover and then varnish in a more colorful color, or to cover and stain the wood grain and then only varnish with a finish that allows you to highlight the wood grain.

Therefore, if we choose an eye-catching color such as black, it can also serve as a kind of stain. As an example you can see the tutorial below.

Below we explain how to use it. You can watch these explanatory videos and download the PDF manual.

Wood preparation

In a bowl put the Grain filler with approximately 10% of warm water.

Mix it until it has no lumps and with a consistency suitable for application, its appearance will be similar to that of a paste.

cover guitar pore

Product application

1. Prepare the surface by sanding with 400 grit sandpaper and remove any remaining solvents or oils.
2. Apply the filler in the direction of the grain and then against the grain. Let dry 10 minutes
3.Remove excess Grain filler with a spatula at a 45 degree angle.
4. Once dry, wipe off the remaining residue with a clean, dry cloth.
5. Sand the surface with 400 grit sandpaper.

close pore guitar


  • If a following application of the product is necessary, let it dry for 30 minutes.
  • The color of the filler can be tinted with our water-based stains.
  • Wait 24 hours to apply any finish.
  • It is not toxic and an inadequate use will not cause problems that can not be solved with sandpaper.
  • This product is useful in any type of wood, not only in guitars.

Tutorial application

Application Tutorial - Black Grain filler

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