To varnish wood, first, prepare the surface by sanding and cleaning. Then, apply thin, even coats of varnish, working in the direction of the grain. Tip-off the varnish after each coat to prevent runs and pools. Allow the varnish to dry completely between coats, and sand lightly with fine grit sandpaper before applying subsequent coats.
Detailed Steps:
1. Prepare the surface:

Sand the wood thoroughly to create a smooth surface for the varnish to adhere to.

Clean the wood to remove dust, dirt, or any residue from sanding or previous coatings.

2. Apply varnish:

Stir the varnish gently before applying.

Use a brush, roller, or spray applicator to apply thin, even coats of varnish, following the direction of the wood grain.

Tip-off the varnish after each application by lightly dragging the tips of a brush across the wet varnish.

3. Dry and sand:

Allow the varnish to dry completely according to the manufacturer's instructions.

Lightly sand the dried varnish with fine grit sandpaper before applying additional coats.

4. Repeat and finalize:

Apply additional coats of varnish, following the same process of application, drying, and sanding.

Once you have achieved the desired finish, allow the final coat to dry completely.