You can apply varnish with a brush or you can spray it.
Varnishing an interior door no panels.
In either case several light coats are better than one or two heavy ones.
Remove any decorative panels to ensure even coverage reinstalling them afterward.
Spar varnish can be applied over raw wood or complimentary stains as recommended by the manufacturer.
Open a window nearby to provide ventilation.
Wipe the door off with a clean cloth to remove any debris so that your varnished surface will have a smooth finish.
Whether you have a new interior wooden door that you plan to stain or an existing door that is already stained a protective coat of varnish is needed to complete your project.
Have the home center or paint store tint the primer to a grayish color to help cover the underlying varnish.
Generously apply the varnish to the top and bottom of the door.
Pour some finish into a clean bucket and dip the bristles about a third of the way into the liquid.
The goal is to remove any flaky varnish and to roughen the surface for a good primer bond.
Wipe off the dust with a brush.
Start on the panels then move to the surround ing moldings.
Soak a new china bristle brush for a minute or two in paint thinner then spin or knock off the excess.
When varnishing a door start at the top and varnish in stages down to the bottom of the door unless you are varnishing a panelled door in which case varnish the panels individually first from top left to bottom right before varnishing the centre vertical panel the cross rails from top to bottom and then the outer edges.
Before applying varnish to your stained door make sure that the stain on the door has completely dried.
All other finishes over raw wood or compatible stains will void our warranty.
Using vertical strokes lightly apply the first coat of marine varnish to all surfaces.
Follow step b for interior doors.
Then using a screwdriver unscrew and remove the door handles any hooks or other hardware.
Follow step a for screen doors and exterior doors.
Marine spar varnish is the only finish coat we recommend.
You must apply marine varnish as described in the next steps or any warranty will be void.