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Why garden furniture deserves a proper job

British gardens are hard on paintwork. A bench can bake in a July heatwave, get soaked through in an August downpour, then sit under frost in January — often within the same twelve months. That cycle of expansion, contraction and moisture is what lifts paint, cracks joints and turns a tidy hardwood table into a grey, weathered wreck. A quick coat slapped on in May rarely survives to the following spring.

The good news is that reinstating garden furniture is one of the more satisfying jobs you can do at home. It costs far less than replacing a set, takes a weekend at most, and a properly prepped and painted piece can comfortably give you five to ten years of service before it needs attention again. The trick is doing the prep honestly and choosing a product built for the outdoors rather than whatever is left in the shed.

Give it a thorough clean first

Paint will not grip to dirt, algae or flaking old coatings, so everything else depends on this stage. Work outside on a dry day and lay down a dust sheet.

• Wash it down. Warm water with a little washing-up liquid and a stiff scrubbing brush will shift most grime and green algae. For heavier soiling, use a dedicated exterior wood cleaner or sugar soap.
• Treat mould and algae. If there is a persistent green or black film, particularly on softwood, apply a fungicidal wash and leave it the full recommended time before rinsing.
• Rinse properly. Residue from cleaners stops paint adhering. Rinse generously, then rinse once more.
• Let it dry completely. Give it twenty-four to forty-eight hours in dry air. Damp timber will trap moisture under the new paint and blister within weeks.

Metal furniture usually only needs a degrease with warm soapy water and a rinse, though any loose rust must be dealt with properly in the next stage.

Sanding, filling and rust treatment

Once dry, run your hand over the surface. Anything rough, flaky or lifting needs attention.

• Feather flaking paint. Sand the edges of any old coating with 120-grit paper until they blend flat into the surface rather than sitting proud.
• Sand the whole piece lightly. A quick pass with 180-grit creates a key for the new paint. Wipe away dust with a damp cloth.
• Fill defects. Small cracks, screw holes and dents take an exterior-grade wood filler. Overfill slightly and sand flush once cured.
• Deal with knots. On bare softwood, seal any knots with knotting solution, otherwise resin will bleed through and stain the finish.
• Tackle rust on metal. Wire-brush it back to sound metal, then apply a rust converter or a rust-inhibiting primer. If the rust has eaten right through a tube, that section is better replaced than painted.

Do not skip the dust removal. A stray brush of sanding dust will show through a glossy finish and ruin the look of your hard work.

Choosing paint that can take the weather

This is where most DIY attempts fail. Interior paint, fence stain and cheap gloss simply are not formulated to cope with UV and standing water on garden furniture. You want a product labelled for exterior use on the relevant material.

• Wood. Exterior wood paint, often water-based and described as a satin or eggshell for exterior use, gives a flexible, breathable film that moves with the timber. A primer is needed on bare wood and on any filled areas.
• Metal. Use a dedicated exterior metal paint, ideally one that says it can be applied directly to sound rust or that comes with a matching primer.
• Colour. Mid to dark tones show dirt less, but very dark colours on south-facing metal can get extremely hot. Pale shades on timber will need cleaning more often.
• Finish. Satin and eggshell are more forgiving than high gloss, which highlights every imperfection in old timber.

Buy enough in one go to complete the job. Tins from different batches can vary very slightly in shade, which is noticeable on a large table top.

Applying the paint properly

Conditions matter as much as technique. Aim for a dry day between about 10°C and 25°C, with low humidity and little wind. Avoid painting in direct sunlight, because the surface gets too hot, the paint skins over too quickly and brush marks set hard.

• Stir, don't shake. Shaking traps air bubbles that end up as pinholes in the dried film.
• Use the right brush. A good-quality synthetic brush for water-based paint, and a natural-bristle brush for solvent-based.
• Work in thin coats. Two or three thin coats always beat one thick one, which will sag, wrinkle and take days to harden.
• Follow the grain. On timber, brush along the grain and lay off lightly at the end of each section to even out the finish.
• Respect drying times. Leave the full interval stated on the tin between coats, and longer in cool or damp weather.
• Do the underside. Sealing all faces, including the parts you never see, is what stops moisture getting in and blowing the finish.

If rain is forecast within the drying window, move the furniture into a garage or cover it — but never drape a tarpaulin directly onto wet paint.

Making the finish last

A painted finish is not permanent, but it is easy to maintain. Check your furniture each spring for chips, scuffs and any spots where the coating has worn thin on edges and armrests. Sand the area lightly, spot-prime if you are down to bare material, and touch in with the same paint while the piece is clean and dry.

Over winter, bring smaller items into a shed or garage if you can. Anything staying outside benefits from being raised off wet paving and covered with a breathable cover rather than a plastic sheet, which traps condensation against the surface. Lift cushions and store them indoors — damp cushions are the fastest route to a mildew problem on both fabric and frame.

Looked after that way, a well-prepped bench or bistro set will keep earning its place in the garden for years, and the next repaint will be a touch-up rather than a full overhaul.