Why prep and product choice decide how long it lasts
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Paint fails. Waterproofing fails faster. When it does, the cost isn't just another coat—it's often removal, repair, and weeks of disruption. The difference between a job that lasts five years and one that lasts five months hinges on two things: how the surface was prepared, and what product went on it. A painter who skips sanding, filling or priming steps and doesn't disclose it may quote lower, but you'll be calling them back while the warranty dust hasn't settled.
The hard truth is that most property owners don't see prep. They see paint. When a quote breaks down the labour cost for sanding, filling, priming and waterproofing primer separately from the top coat, it looks expensive. But that breakdown is your map to durability. Without it, you're flying blind.
Surface prep is non-negotiable, whether it's cosmetic or structural
A wall that's been painted ten times over will shed your new paint if the layers beneath are loose. Damp concrete, chalky exterior paint, mould, and old caulk all sabotage adhesion. Proper prep means identifying what's actually there, removing what won't hold, and creating a smooth, clean, dry base. On exterior walls and waterproofing work, this includes power-washing, stripping failed paint, filling cracks, and treating mould. On interior walls, it means filling holes, sanding gloss, and priming stains. The work is slow, dusty, and invisible when it's done well. It's where money spent now saves money later.
A painter who rushes or skips these steps without telling you might sand lightly, skip the power-wash, or prime over a stain. The paint will look fine for six months. By month eight or nine, blistering, peeling and staining start. The cause wasn't bad paint—it was bad prep. When you compare quotes, ask what prep is included. If one quote is a quarter of the others, ask why. The answer will tell you whether you're saving money or borrowing trouble.
Product choice makes the difference between adequate and durable
Paint is not paint. A tin of basic acrylic interior emulsion costs half the price of a quality exterior acrylic, but it's not interchangeable. Exterior paint needs flexibility to move with temperature swings, durability against UV and moisture, and adhesion to bare masonry or weathered surfaces. Waterproofing products need to seal cracks, resist water pressure, and stay flexible. Interior paint for high-moisture areas (kitchens, bathrooms) needs mildew resistance and washability. A painter who specifies the right product for each surface and exposure is protecting you; one who recommends a product without explaining why it suits the surface and exposure isn't giving you enough to judge the trade-off.
Products also vary in coverage, drying time, and how many coats they need. A premium paint might cover in two coats; a budget paint might need three. Over the life of the job, the real cost can flatten or even reverse. When you receive quotes, ask what brand and grade the painter is recommending for each area, and why. Vague answers (
Common questions
- Why do some painters' quotes leave out prep costs?
- Painters competing on price often bundle prep into labour or omit it entirely to look cheaper upfront. When prep isn't itemised separately, ask directly what sanding, filling, priming and surface treatment is included. If they can't or won't detail it, that's a red flag.
- Does expensive paint always last longer?
- Premium paint usually has better binders, pigments and flexibility, and covers better in fewer coats—but only if the surface is properly prepared first. Cheap paint on a well-prepped wall beats premium paint on a poorly prepped one. Matching the right grade to the exposure (exterior, high-moisture, bare masonry) matters more than paying the highest price.
- What should I look for in references?
- Ask for jobs the painter completed two or three years ago, not recent ones. Contact the property owner and ask whether the paint is still in good condition, whether any peeling, mould or blistering has appeared, and whether they'd hire the painter again. Recent work can't tell you about durability.
- Can I save money by buying my own paint and giving it to the painter?
- You can, but it shifts responsibility. If the paint fails, the painter may argue it wasn't the product they'd have chosen. A painter who specifies and supplies their own materials takes ownership of the choice and the outcome. That accountability is worth the cost.
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