|
2torial #0549:
Learn2 Varnish a Wood Surface
"Could be a sticky situation!?!"
For protecting wood furniture from the elements,
synthetic varnish can be a strong ally. Just wander
down to any yacht harbor and examine boats with
shiny wooden rails and trim: nobody knows better
than a boat owner how to avoid the trials of sun,
storm, and salt. But a sailor also knows patience.
Applying the thick, slow-drying varnish will help
hone those skills as well.
Bring your furniture item into a temperate,
dust-free room if possible: varnish is very sticky
and you'll want to avoid creating a bug and leaf
collage. If working outside, choose a moderate,
windless day.
Get your surfaces ready for varnish: remove any
excess paint, sand the surface to the desired
smoothness, and dust out any residue from the
corners.
Select the proper varnish
Most varnishes are alkyd,
and those containing tung oil are more
water-retardant than those with linseed oil. Alkyd
is not as unyielding as polyurethane and often more
attractive. It is the best choice for fine wood
pieces.
Polyurethane is best used on "everyday" pieces
that take a real beating. Drying time is fast (4
hrs. instead of the usual 24) and you don't need to
go back and level your brush strokes. But by
providing such a truly solid layer, polyurethane
more resembles plastic than wood: avoid using it on
fine wood. Polyurethane varnish is so tough it
often requires an electric sander to remove.
Use phenolic resin or spar varnish for outside
work or for boats. These varnishes are too thick
and will yellow too much over time for fine wood or
interior work.
Prepare your area
Lay down enough newspaper to exceed your
project's width by two feet in each direction. This
will help protect your floor from drips. Take a
tack cloth and wipe up any trace of dust or sanded
paint on the surface of your furniture.
Learn the stroke
Chart out your areas of attack in a way so you
don't have to stop in the middle of a panel. Shake
any dust off your brush and fill it with varnish.
Brush across (not with) the grain with long
strokes. Repeat the process, making a one-inch
overlap from where your last stroke ended in order
to avoid patches.
Even out and level the varnish
surface
Once you've covered the panel you will go back
over and work with the grain. Remove any excess
varnish from your brush on the rim of the can, then
brush lightly over the wood surface. If too much
varnish builds up on your brush as you continue,
swipe it along the rim of the can to dry it off.
Brush over the wood surface only once, making the
coat as smooth and even as possible.
Perform the art of tipping off
Now for the last smoothing
step.
Tipping off is a dry brush method of using just
the tip of your brush to do away with the last
brush stroke (or finger) marks. Moving in rows with
the grain, hold the brush perpendicular to the
surface and barely stroke the surface of the wood.
Repeat Steps 3-5 for each segment of your
project.
Prepare properly for the second
coat
It is a good idea to wait one full day before
embarking on your second coat. First you must use
the sandpaper to softly "take back" (usually in one
pass) the first coat. Do this by sanding gently
with the grain into the first layer of varnish. You
want to rough up the surface enough so the second
layer can set without going through to the bare
wood. Clean the surfaces with the tack cloth. Now
you can repeat the varnishing steps again!
-end-

Learn More!
|