A painting job is judged on what remains after three years, not on the effect of the first evening. Yet most of what decides that lifespan happens before the colour: in assessing the substrate, filling, sanding and priming. That is the trade's paradox — the work that counts is the work that disappears.
Paint that blisters was not badly applied
Blistering, flaking, chalking, peeling in sheets: these failures almost always have the same origin, and it is not in the way the paint was applied.
A dusty substrate does not hold paint. Nor does a greasy one. Old paint that is letting go takes whatever is applied over it with it. Filler still damp traps moisture under an impermeable film, which eventually lifts. A substrate incompatible with the chosen product gives the same result a few months later.
In every one of those cases, the paint merely revealed the state of what lay beneath. Hence the trade's rule: you do not paint a substrate you have not prepared, and you do not prepare a substrate you have not examined.
Looking at the substrate before quoting
A quotation drawn up per square metre without having seen the room is an estimate, not a price.
What you look at: the nature of the substrate — plaster, cement render, timber, old paint, a covering —, its condition, its adhesion, its dust, its flatness, cracks and how they run, marks of damp, visible mould, previous patching, what has already been applied over it.
You also look at context: how a façade is exposed, how a room is ventilated, its use — a kitchen, a bathroom and a bedroom are not under the same strain.
Those observations determine how much preparation is needed, which is the genuinely variable item on a job. Two rooms of the same area can call for very different work; that is what the quotation should reflect, item by item, rather than melting everything into a single figure.
Damp: repainting settles nothing
This is where an honest painter sometimes loses a job — and does the greatest service.
A damp stain, efflorescence, mould or paint peeling at the foot of a wall are symptoms. Covering them does not treat the cause: water keeps arriving, and the failure returns, often worse because the new film has trapped it.
The possible causes are many and do not all belong to the same trade: infiltration through the façade or roof, rising damp, a leak in the pipework, a failure of waterproofing, condensation linked to inadequate ventilation. Identifying which is at work sometimes calls for assessment by a competent professional — and that is exactly what a painter should say when the signs do not converge.
On the substance, the World Health Organization devotes indoor air quality guidelines to dampness and mould: they point out that persistent dampness encourages microbial growth indoors, associate that dampness with increased prevalences of respiratory symptoms, allergies and asthma, and set out prevention and reduction of persistent dampness as the principal recommendation. A painter makes no health diagnosis and pronounces on nobody's condition; they observe a defect in the building, explain that covering it does not treat it, and refer the client on.
Preparation, which takes the longest
It often represents most of the job, and it explains the gap between two apparently comparable quotations.
It includes, depending on the case: stripping or brushing off whatever is not holding, filling holes and cracks, skim coating where flatness requires it, sanding, dust removal — a step rarely skipped without consequence — and pre-treating a particular substrate where necessary.
Cracks deserve separate attention. A surface hairline crack can be dealt with; a crack that goes through, that is moving, that follows a structural angle or that always reappears in the same place after repair is not a paint problem. It may belong to a qualified professional for anything structural, according to the locally applicable framework, and a serious painter says so rather than filling it a third time.
Protecting before starting
Painting dirties everything that is not protected, and that protection is part of the service.
In practice: moving and gathering the furniture, sheeting it, protecting floors, masking joinery, switches and sockets, removing or protecting anything fragile. The client generally keeps responsibility for valuables and personal items, and that is said beforehand.
It is also an immediate professional marker: a painter who starts painting without having protected anything is announcing the state in which they will hand the room back.
Products, ventilation and protection
Paints, fillers, strippers and solvents are chemicals, and they are used as such.
The international framework here is the chemicals convention adopted in 1990 by the International Labour Organization, together with its recommendation: it deals with classification and labelling, safety data sheets, employer obligations, information and training for workers, and the protection made available to them.
Translated onto a site: products labelled and kept in their original containers, never decanted without identification, never mixed together, used according to the manufacturer's instructions, with the protection the data sheet specifies and adequate ventilation in an enclosed room. Occupants — particularly children and sensitive people — are kept away during application and for the stated drying time.
Work at height falls under a separate requirement, set internationally by the International Labour Organization's code of practice on safety and health in construction: suitable and inspected means of access, trained personnel, prevention of falls. A façade is not treated from a leaning ladder to save time; whatever cannot be done safely is entrusted to a properly equipped firm.
Primer, finish coats and handover
Primer is not a cheaper coat of paint: it is a product whose job is to make what follows hold, and it is chosen according to the substrate. A new substrate, old paint, cement render or timber do not call for the same primer.
Finish coats are written out in full on the quotation. A single coat, even over a similar shade, leaves differences visible in raking light — that is, precisely the light in which the client will look at their wall at the end of the day.
Handover happens with the client, in that same raking light, going round the corners, the joins, the frames and the skirtings. Any touch-ups are noted and done. The job ends with the room put back: furniture returned, protection removed, floors cleaned, waste taken away.
In the African context
Conditions vary sharply between countries, cities and seasons: there is no typical African painting job, and the same façade is not treated the same way from one region to another.
The first reality is climate. Depending on the area, direct sun, heavy seasonal rain, ambient humidity and temperature swings put exterior coatings under strain. The choice of product and the timing of application then become decisive: painting a façade just before the rainy season, or in full sun on a hot substrate, compromises the result whatever the product's quality. A professional who postpones a job for that reason protects their work as much as their client.
The second is dust. In several cities, for part of the year, removing dust before application is not a formality: it governs adhesion, and it sometimes has to be repeated just before painting rather than the day before.
The third is damp in the building fabric. Where a significant share of homes is built progressively, it is not unusual to paint over substrates that are still young or over masonry repaired in stages. Being able to say that a substrate is not ready — and what will follow if it is painted anyway — is a commercial skill as much as a technical one.
The fourth is supply. Depending on the market, the availability and quality of paints, fillers and primers vary, and products that look alike do not behave the same way under sun or rain. Knowing what holds up locally, and saying so, beats applying a rule learned elsewhere.
The fifth is professionalisation, and it is a concrete opportunity. A quotation that itemises preparation, serious protection of the home, a stated number of coats and a handover done in raking light immediately distinguish a professional in a market where many sell by the square metre without looking at the wall. That opens access to work for companies, shops and managing agents, who ask for detailed quotations and invoices. Digital contributes unevenly across markets: before-and-after photographs with the client's agreement, messaging to approve a shade, mobile payment for deposits. The International Telecommunication Union puts the share of the world's population using the Internet at 74 per cent in 2025, with 36 per cent for Africa, the lowest of the regions it measures: these channels matter where they exist, without replacing the visit to look at the substrate.
What a painter does not promise
They do not promise that paint will hold on a substrate they were told not to prepare, nor the disappearance of damp whose cause has not been treated, nor the stability of a structural crack, nor a finish identical to a sample seen under different light, nor a stated lifespan on an exposed façade. They stand in neither for a qualified professional on structure, nor for a plumber, nor for a roofer, nor for a decorator on designing a scheme.
What they do commit to can be checked: an examination of the substrate before quoting, a quotation itemising preparation, protection of the home before starting, products used according to their documentation, a stated number of coats, a handover done with the client and a room handed back in order.
That is also what makes the business credible: real past work, a readable quotation, deadlines kept, invoices and genuine reviews. What convinces here is not a tool but a record: jobs someone can go and look at.
Artificial intelligence can help prepare a quotation, calculate quantities from measured areas, sort colour references or draft a report. It does not see the substrate, does not say whether it is sound, does not determine the cause of damp, and replaces neither the manufacturer's documentation nor the site visit.