Hello. As long as the older wood is in sound condition (it isn't peeling or lifting), our Stainable Wood Filler should be fine for use. However, here are some helpful tips to help ensure a successfull project. . Minwax Stainable Wood Filler accepts stain, though sometimes at a different rate from the surrounding wood. This is often due to the natural porosity, age, or moisture content of the wood. Please try these suggestions, based on lab tests for the Minwax Stainable Wood Filler, to get a closer match to the surrounding stained wood:
1.) Lightly sand filler before applying stain (no finer than 100 grit.) Over-sanding or using a finer grit tends to close pores.
2.) Stain as soon a possible after filler hardens, following label instructions for the stain. The longer the filler cures, the harder and less porous it will be, and therefore the less stain it will absorb.
3.) If the first coat of stain is not as dark as desired, in a sample area use a piece of 100-grit sandpaper and dampen the sandpaper with the stain you are using. Use this paper to wet sand the Stainable Wood Filler. I would recommend rubbing out the area with light pressure in the same direction as the wood grain. Increase your rubbing/sanding pressure as needed. You should notice that the combination of the stain and sandpaper is blending the Wood Filler compound with the surrounding stained wood. Here again, practice your technique in a test area or inconspicuous spot.
4.) If the spots are so small that the wet sanding technique is not practical (finish nail holes), you may have to use a topical stain, such as Minwax Gel Stain, in a matching color, and using an artist's brush, paint the stain lightly on the spots. Rather than wiping, allow the stain to dry on the surface, which may take up to 48 hours. If desired, to achieve more of a wood grain effect, 5 minutes after applying the stain, use a dry brush to drag through the stain in the direction of the wood grain, then let dry.These techniques will help blend the filler with the surrounding stained wood. Yes, it is safe to walk on but like anything else, you will have to replace over time; more so if the wood is in older condition.
Regards, Minwax Customer Support
Date published: 2019-06-18