You don't. It would just remove some of the stain and give you an uneven color. Lightly sand between coats if putting down more than one coat of varnish. Remove dust before applying the second coat.
I sand it with a final sanding of 400 grit paper, then scrub it with 0000 steel wool, wipe it of carefully then give it first staining with a rag dipped in the stain.
never sand wood across the grain always sand with the grain
never sand wood across the grain always sand with the grain
If you have solid wood doors, first strip your door down to the bare wood. Next sand your door with 120-150 grit sand paper with the grain of the wood. Now you can stain your door with a custom color stain if you choose. Last put some sort of a finish on your door after your stain has dried completely. Any part or all of this work can be done for you at a reputable furniture refinishing shop.
After. If you waterproof before staining, the stain won't make it to the wood to stain it.
With tree types of wood you may have to stain each one separately. All three types of wood will have different porosity and maybe a different base color of their own which will make staining the same color a challenge. Perhaps an opaque stain would work better allowing you to see the grain of the wood but have a more uniform color.
Here this is an example one : This is applied to the wood before staining and reduces the porosity of the wood.
Wood stain is a substance that you can use to change the color of wood. It comes in many different shades, both light and dark.
sand
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No. It is recommended that you let it dry before staining
it can fix wood, doors and all other bits of wood