Sand and Recoat Yellowed Gloss Skirting with Dulux Trade Satinwood over a Bulls Eye 123 Primer

Yellowing on old gloss comes from oxidation of the alkyd resin, and sanding will not remove it in any useful way. You can flat the whole board back to bare wood, put on a cheap solvent gloss, and watch the same yellowing return within two or three years. That is why many people move to a water-based Satinwood at this stage. Dulux Trade Satinwood stays close to the colour in the tin for far longer, and its mid-sheen hides more of the dents and scuffs a skirting takes at ankle height.

The job has three practical problems: getting adhesion onto hard aged gloss, stopping stains from ghosting through a white topcoat, and laying off water-based paint before it starts dragging under the brush. Bulls Eye 1-2-3 deals with the adhesion and most moderate staining. Sanding has a narrower role: it gives the primer a keyed surface to grip.

Why use 1-2-3 before Satinwood

Bulls Eye 1-2-3 is a water-based bonding primer. It grips glossy, chalky and awkward surfaces where a regular acrylic undercoat can slide around. Aged oil skirting is exactly that kind of surface: hard, slick, and often faintly chalked from years of washing. At room temperature the primer flashes off in around an hour and then sands to a fine dust, which matters under a satin finish because any roughness reads through the sheen.

It also blocks moderate staining. Old skirting often carries biro marks, water tide-lines near external walls, and the odd bruise of nicotine near a fireplace. In most cases, 1-2-3 holds those back under one coat. A heavy water stain or a resinous knot needs a stronger spot treatment first, such as Zinsser B-I-N or another shellac-based primer, or a dedicated knotting solution. A knot that has bled once will bleed again through water-based coatings, so seal it with shellac and let that dry hard before priming the whole run.

Leave primer out and the topcoat may look sound for a fortnight, then peel in sheets the first time a hoover clips the board.

Sanding the old gloss

Start with 120 grit on old gloss. The aim is a uniform dull surface with no shiny patches left, because each glossy patch is a place where the primer will have less grip. After sanding, run your hand along the skirting. It should feel matte and slightly toothy from end to end.

The moulding needs the same attention as the flat face. Fold the paper into the profile, or use a sanding sponge. The flat top of the skirting can be dulled in thirty seconds, while the coved profile and bottom edge against the floor often keep their gloss. Those missed strips are where failure usually starts. A medium-grit flexible sponge follows the curve without cutting through on the high points.

Lead paint is the edge case that changes the method. Paintwork from before the 1970s in many homes can contain lead in the older layers. Dry-sanding releases dust that spreads through the room. A 3M lead test swab from a decorating merchant takes two minutes and tells you whether to switch to wet-sanding with fine wet-and-dry paper and a bucket. Wet-sanding keeps the dust down as a slurry that can be wiped up.

After sanding, remove the dust completely. Vacuum the board and the floor line, then wipe with a cloth barely dampened with water or white spirit. If primer goes over dust, it bonds to the dust layer, and the first knock can lift the coating away.

Filling chips, mitres and wall gaps

Old skirting usually has three defects worth dealing with before primer: chips along the top edge, splits where two lengths meet at a mitre, and the long gap between the board and the wall. Fill chips and mitre splits with a two-part wood filler or a fine surface filler. Put it on slightly proud, let it harden, then sand it flush. Most fillers sink a little as they cure, so overfilling and cutting back gives a cleaner repair than trying to finish it perfectly while wet.

The wall gap is caulk, not filler. Run a thin bead of decorator’s acrylic caulk, then smooth it with a wet finger. That closes the dark shadow line that makes freshly painted trim look unfinished. Cut the nozzle small; a fat bead looks clumsy and can draw the eye more than the gap did. Let the caulk skin for the time stated on the tube before painting, because wet caulk trapped under paint can crack along the line later.

Repairs need their own primer. Bare filler soaks differently from old gloss that has already been primed, and Satinwood over raw filler can leave a dull flashed patch where the sheen dies. Dab 1-2-3 onto every filled chip, every mitre repair and every caulked section before the full topcoat goes on.

Getting water-based Satinwood to lay off cleanly

Water-based Satinwood behaves differently from old oil gloss. It grabs faster, so repeated brushing over the same patch quickly leaves ridges. Use a synthetic-filament brush, with Purdy or Wooster in the 38mm to 50mm range being a sensible size for skirting. Natural bristle drinks water and goes limp in acrylic paint.

Work in lengths of about a metre. Lay the paint on, spread it, then lay off in one direction with light strokes and leave the section alone. Going back into paint that has already started to grab is what leaves brush lines that dry hard. In a warm, dry room, a small amount of a water-based conditioner such as Owatrol Floetrol can open the drying time and help marks flow out. A capful per half-litre is plenty; too much will drop the sheen.

Satin looks cleaner with two thin coats than with one heavy coat. The first coat over 1-2-3 will look patchy in raking light because the primer and the paint have different absorbencies. The second coat evens the sheen and buries the join lines. Between coats, sand very lightly with worn 240 grit or a grey scuff pad, only enough to knock off dust nibs that landed while the paint was wet. Wipe clean before recoating.

Against carpet, cut in with the edge of the brush and a length of masking tape pressed down hard, or slide a thin card down into the pile to hold it back. Pull the tape while the paint is still slightly wet so it does not tear a dried edge.

Recoat timing

Dulux Trade Satinwood may be touch-dry in a couple of hours, while a cold or humid room can still need a much longer recoat window. If the heating is off, give it the full overnight. A second coat dragged over paint that has skinned without curing can pull the underneath layer and leave marks that stay visible.

Working a hallway run

A hallway skirting is difficult to finish cleanly because it sits in traffic before it has fully hardened. People brush past it, bags hit the board, and a hall with an external door can swing ten degrees colder than the rooms off it. That temperature change slows the acrylic and can bring condensation onto a half-cured surface, flattening the sheen in patches.

Plan the run so you are never painting toward a wet edge that you need to step over. Start at the point furthest from the door you use, work back toward it, and paint the whole continuous length in one session. If you stop and restart an hour later, a lap line in Satinwood will catch the light down the hall.

Protect the coating while it cures. Fresh hallway skirting can stay soft to fingernail pressure for a day or two even when it feels dry, which is when a shoe or delivery box can take a chunk out of it. If possible, do the hall last and keep through-traffic away overnight. Where that cannot happen, keep a little paint in a small sealed jar for touching in scuffs after a week.

The emulsion above the skirting takes the same beating in a hall, which is why a scrubbable wall finish earns its place beside satin trim below. The trim still shows the abuse first, because the sheen throws every mark straight back under the hall light.