Do I Need to Apply a Waterproof Base Before I Stain & Varnish My Wood Doors?

Preparation of the Wood

• Before the possible application of any base or stain to a door, there are some essential steps to undertake. Locate as close to a dust free environment as possible to work on the doors. Wipe down the doors to remove as much dust and grime as possible. Lightly sand the whole door with 220-grit sandpaper. Wipe the door down again to remove any residue from the sanding.

When a Base is Necessary

• The wood type of the door is the most important factor in determining if a base is necessary. Soft or porous woods like fir, pine, Aspen and maple require a base layer because these woods will absorb the stain unevenly, causing a splotching effect. Some stain manufacturers such as Minwax sell a preconditioner that they ask be applied no matter what type of wood is being stained. A hardwood door does not usually require a base, and not using a base might be preferable for for aesthetic reasons.

The Purpose of Varnish

• Another reason a waterproof base or any other kind of base might not be necessary to apply to the door is that the use of a varnish will seal the door, thus protecting it. Also, any finish applied helps to protect the wood while certain stains are manufactured as also sealants.

Key Staining Tips

• The quality of the sanding will affect the quality of the finish. Always completely follow the manufacturer's preparation and application instructions. If you have any questions, contact the manufacturer.