Chalk-style paint on old furniture: a careful step-by-step guide

Chalk-style paint has earned its reputation as the forgiving option for tired furniture. It is a thick, ultra-matt, water-based paint that grips most clean surfaces with very little preparation, dries quickly and sands back easily for a softly worn look. "Very little preparation" is not the same as none, though, and old New Zealand furniture comes with one hazard that no tin of paint mentions: the layers already on it.

This guide walks through the process the way we would approach a second-hand dresser, bedside table or set of dining chairs, starting with the step most people skip.

Before you start: check for lead paint

If a piece has already been painted, find out what is underneath before you sand anything. Lead pigments in oil-based binders were the standard house paint in New Zealand until the mid-1960s, and WorkSafe advises that any building from the 1980s or earlier should be presumed to have been painted with lead-based paint. Furniture often shared that paint: pieces were painted to match a room, or finished with whatever was left over from the weatherboards.

You cannot tell lead paint by looking at it. A home test kit from a paint retailer gives a rough indication, and an accredited laboratory can test paint chips if you want certainty. Treat any old painted piece as lead-painted until a test says otherwise.

If lead is present, or you are not testing, the rules are simple:

• Do not dry-sand, power-sand, heat-strip or burn it. Dust and fumes are how lead gets into the body, and young children are especially at risk.
• Work wet. Mist the surface with water or dip your sanding block in water, and use a hand scraper for loose flakes so they come away as chips rather than dust.
• Contain everything. Lay drop sheets, keep children and pets away, wear a properly fitted dust mask, and bag up debris as you go. Do not use a household vacuum to clean up.

WorkSafe's guidance on managing lead-based paint links to the full national guidelines, and Level's lead paint page sets out the safer removal methods in plain terms. The good news is that chalk-style paint suits this situation well: if the existing paint is sound, you can often clean it, wet-scuff it lightly and paint straight over it, sealing the old layers in rather than disturbing them.

Treat any old painted piece as lead-painted until a test says otherwise.

Step 1: clean properly

Years of furniture polish, cooking grease and hand oils are the main reason a painted finish fails. Remove drawers and hardware, then wash every surface with warm water and a degreasing cleaner such as sugar soap. Rinse with clean water and let the piece dry fully, ideally overnight. Pay attention to drawer fronts and the edges of tabletops, which collect the most grime.

While it dries, check the structure. Wobbly joints, lifting veneer and sticking drawers are much easier to fix before paint goes on than after.

Step 2: scuff, do not strip

Chalk-style paint is marketed as needing no sanding, but a light scuff improves adhesion on glossy varnish, lacquer or old enamel. Use a fine sanding sponge, around 180 to 240 grit, just enough to dull the shine. On bare or previously painted timber where lead is possible, keep the scuff wet as described above. Wipe off the residue with a damp cloth and let it dry.

Fill dents and gouges with a wood filler and sand those patches smooth once set.

Step 3: block bleed-through

This is the step that saves the most heartache. Tannins in some timbers, old wood stains, knots and water marks can migrate through water-based paint and appear as pink, yellow or brown blotches, sometimes only after the second coat. Older mahogany-toned and red-stained finishes are common offenders.

The fix is a barrier coat of shellac, which is long established as a tannin and stain blocker. Apply one or two thin coats with a brush or cloth over the whole piece, or at least over any patch you suspect, and let it dry. Shellac dries quickly, so this adds little time. If you are unsure whether a piece will bleed, paint a small test patch on the back first and wait a day.

Step 4: paint in thin coats

Stir the paint thoroughly. Apply the first coat thinly with a good synthetic or natural-bristle brush, working in the direction of the grain on flat surfaces. Chalk-style paint is thick, and heavy coats can crack as they dry or leave drag marks, so two or three thin coats beat one heavy one.

Let each coat dry to the touch, which is often within an hour in mild weather but longer on a cold, damp day. On a humid Auckland afternoon or in a cold garage in winter, give it extra time. A light pass with a fine sanding pad between coats removes brush nibs and gives a smoother final finish.

Step 5: distress, if you want to

Distressing is optional and easy to overdo. If you want a worn look, use a fine sanding pad on the places hands and feet would naturally wear: edges, corners, around handles and along the base. Stop sooner than you think you should and step back. Two or three subtle worn areas look more convincing than every edge rubbed back to timber.

Distressing reopens the lead question. Only sand through to earlier layers if you know those layers are lead-free.

Step 6: wax or water-based lacquer

Chalk-style paint is porous and marks easily when unsealed, so it needs a topcoat. You have two broad options.

Furniture wax

Clear or tinted soft wax gives the classic low-sheen, slightly velvety finish. Apply it thinly with a cloth or wax brush, work it in, wipe off the excess and buff once it has hazed. It looks beautiful on display pieces, mirrors and occasional furniture. The trade-offs are that wax is a soft finish, it needs reapplying from time to time, it can show water rings and heat marks, and it is hard to paint over later without thorough cleaning.

Water-based lacquer or polyurethane

A clear water-based topcoat in a matt or satin sheen is the practical choice for dining tables, desks, kitchen chairs, children's furniture and anything that will be wiped down often. Apply two or three thin coats with a synthetic brush or foam pad, sanding very lightly between coats. Choose a non-yellowing product for pale colours, and test it on the back of the piece first, because some topcoats darken or slightly change the paint colour.

As a rule of thumb, wax suits pieces you look at, and lacquer suits pieces you use.

Step 7: let it cure

Dry is not the same as cured. Paint and topcoats may feel dry within hours but take considerably longer to reach full hardness, often several weeks depending on the product, temperature and humidity. Check the label for the manufacturer's curing time.

During that period, put the piece back in service gently. Avoid sliding heavy objects across the top, use coasters, do not put rubber or plastic items on it for long, and give drawers a few days before refilling them. If the piece has a waxed finish, buff it again after a week or two.

A quick checklist

• Test or presume lead on any painted piece, and never dry-sand old layers.
• Clean and degrease thoroughly, then dry.
• Scuff lightly, wet if in doubt, and fill damage.
• Seal suspect timber or stains with shellac.
• Paint two or three thin coats.
• Distress sparingly, and only where it makes sense.
• Wax for display pieces, water-based lacquer for hard-working ones.
• Let the finish cure before heavy use.

Done this way, a chalk-style finish on an old piece can last for years, and the history in its earlier layers stays safely sealed underneath.