When a decorated room looks wrong, the paint is rarely the culprit. Ridges around filled holes, a wall that shows every roller mark, woodwork that feels gritty under the hand, a line at the cornice that wanders: these are preparation problems, and no amount of expensive paint corrects them. Paint is a thin film. It reveals what is underneath rather than hiding it, and the better the paint, the more honestly it reports.
Preparation is not difficult. It is mostly a matter of doing things in the right order and being willing to wait, and getting the order right is what turns a three-day job into a two-day job.
The sequence, and why it is that sequence
Clear and protect first. Furniture out or into the middle of the room and covered. Floor covered properly, with dust sheets taped at the edges rather than laid loose. Curtains, blinds and light fittings down where possible.
Then fill and sand, before anything else. Filling after you have painted means sanding into fresh paint and repainting the patch, which never quite matches. Fill every hole, dent and crack now, slightly proud of the surface, because filler shrinks slightly as it dries and a flush repair becomes a small dip. Sand back flat when it is genuinely dry.
Then caulk the gaps. Caulk is for the junctions: skirting to wall, architrave to wall, around door frames. It stays flexible and copes with the seasonal movement that would crack a hard filler. Run a thin bead, smooth it with a wet finger, and wipe the excess immediately. It is the cheapest thing you can do to make a room look professionally finished, because it removes the shadow lines that read as untidiness.
Then wash down and dust off. Walls carry more grease and dust than people expect, particularly in kitchens and above radiators. Sugar soap and a rinse, then let it dry completely.
Then ceilings, then walls. Always ceilings first. Painting a ceiling produces spatter, and you would rather that landed on a wall you have not painted yet. Cutting in the ceiling and bringing the wall colour up to meet it also gives a cleaner line than the reverse.
Then woodwork last. Woodwork is the most visible work in the room and the finish that shows every fault, so it deserves to be done when there is nothing left to spatter it, and when the sanding is over.
Cut in per coat, not per room
This is the change that saves the most time, and the one most people get wrong on their first room.
The instinct is to cut in the whole room with a brush, then roll the middles. Do it that way and the brushed edges will have dried by the time the roller reaches them. Dried brushwork and wet roller work do not blend; you end up with a visible band of slightly different texture around every edge of the room, and no way to fix it except another coat.
Instead, work in sections. Cut in one wall, or one manageable stretch, and roll it immediately while the cut-in edge is still wet, taking the roller as close to the brushed edge as it safely goes so the two blend into a single film. Then repeat the whole process for the second coat.
It feels less efficient because you are picking up and putting down two tools. It is faster in practice, because you are not painting a third coat to hide the framing effect.
Drying times, honestly
Tubs and tins quote optimistic figures, and they quote them for laboratory conditions: a warm room, moderate humidity, decent air movement, a thin application. A cold British room in November is not that.
Filler is the worst offender. Deep fills, and fills in cold or damp rooms, take considerably longer than the tub suggests, and filler that is dry on the surface can still be soft underneath. Sand it too early and you drag it rather than cut it, leaving a smeared patch that shows through the paint. Deep fills are better done in two shallower applications, and better still done the evening before you intend to sand.
Emulsion between coats is usually reasonable, but "touch dry" and "ready for a second coat" are different states. Rushing the second coat pulls at the first and can leave patchy sheen. Woodwork finishes want longer still.
The general rule: if the room is cold, if the air is damp, or if you have applied the material thickly, add time. Nothing is lost by waiting, and a great deal can be lost by not.
Sanding between coats on woodwork
Woodwork is where the difference between a decent job and a good one is most visible, and it comes down to sanding.
Sand lightly between every coat, with a fine abrasive. You are not removing the coat, you are knocking back the raised grain and any dust that landed in the wet film. The surface should feel entirely smooth to the palm before the next coat goes on. Then dust off with a tack cloth or a slightly damp lint-free cloth.
Skipping this is why home-painted woodwork often feels rough even when it looks acceptable. Doing it is not skilled work; it is five minutes per door that most people do not spend.
Dust management
Sanding dust will ruin fresh paint, and it will find its way into the room hours after you thought you had finished.
Vacuum rather than sweep; sweeping puts the dust back into the air, where it settles onto whatever you have just painted. Vacuum the floor, the skirting tops, the window boards and the tops of doors, then wipe down with a damp cloth, since a vacuum leaves the finest dust behind. Close the door to the rest of the property while sanding, and be sensible about ventilation afterwards: a wide-open window on a windy day brings in as much grit as it removes.
What to do the night before
The difference between a productive morning and a wasted one is usually decided the previous evening.
Do the filling and the caulking the night before so both are properly cured by the morning and you can go straight to sanding. Move and cover the furniture, lay the dust sheets, take down the curtains, and remove the door furniture rather than masking around handles you could simply take off. Wash the walls so they have all night to dry.
Open the paint and stir it. Check you actually have enough, and check you have a spare roller sleeve and a second brush. Running out mid-wall is genuinely costly, because a wall painted in two sessions with a dry edge in the middle will show that edge.
When to stop and call someone
There are a few situations where preparation is not the answer.
If you find damp, do not paint over it. Find the cause and deal with it, because paint applied to a damp wall will fail in a way that costs more to correct than the original problem.
If the plaster is blown, meaning it sounds hollow when tapped and moves under pressure, it needs a plasterer. Filling it will buy a few months at most.
If old paint is flaking in sheets, or a previous coat lifts when you sand it, there is an adhesion problem underneath that will repeat itself. Take the surface back properly or get advice. And if the room contains older materials that could be disturbed by sanding, stop and check before going further.
The point of all of it
Preparation is unglamorous and takes longer than painting. It is also the whole job. A well-prepared wall in a modest paint looks better than a poorly prepared wall in the finest paint made, and the effort you put in before the first coat is what you will be looking at for the next ten years.
Which is an argument for being equally deliberate about the colour. If the surface is going to be that good, it is worth knowing the shade is right before the first tin is opened. Hand-painted A6 samples are £2, and a few days watching two or three of them on the wall is a small delay against a job you are about to do properly.
