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Planning & Preparation

How Professional Painters Prepare Walls Before Painting

A lasting paint finish begins before the first coat. Learn how Gillet Painting assesses, repairs, cleans, primes and protects interior and exterior surfaces across Niagara.

Interior preparation work around walls and millwork

The quality of a paint job is decided long before the finish coat. Colour and product matter, but neither can compensate for loose paint, movement cracks, grease, moisture, glossy surfaces or repairs that were never properly sealed.

For homeowners comparing estimates, preparation is also where scopes differ most. Two painters may both quote “two coats,” while one includes washing, repairs, sanding, caulking and primer and the other begins applying paint almost immediately. The totals are not describing the same job.

Start with the surface, not the colour

A useful inspection identifies what the new coating must bond to. Drywall, plaster, wood, masonry, metal and previously painted surfaces each behave differently. The existing finish matters too: a sound acrylic wall coating is a different starting point from old alkyd paint, chalking exterior paint or a deck with a failing stain.

Gillet Painting looks for:

  • Peeling, flaking, blistering or chalking coatings
  • Water staining and the source of the moisture
  • Nail pops, joint cracks and movement around openings
  • Grease, soap residue, smoke film and hand oils
  • Glossy surfaces that may resist adhesion
  • Failed caulking around trim, windows and joints
  • Soft wood, rot or other damage that paint cannot repair
Interior preparation work around walls and millwork
Preparation in progress from the inherited Gillet project archive.

Repairs need to disappear under normal light

Filling a hole is only the beginning. A repair should be brought flush with the surrounding plane, feathered beyond its edge and sealed when necessary so it does not flash through the finish. Strong side light can reveal ridges and patches that look acceptable when viewed straight on.

On plaster and older walls, the objective is not automatically to make the surface look like new drywall. Slight movement and age may belong to the room. The decision is whether to stabilize and preserve the existing material, carry out a localized repair or renew a larger section.

Cleaning is part of adhesion

Kitchens, bathrooms, railings, doors and cabinetry frequently need more than dusting. Paint does not bond reliably through cooking residue, silicone cleaners, wax, nicotine or soap film. The cleaner must also be compatible with the surface and removed according to its instructions. Painting over residue can create craters, poor adhesion or premature peeling.

When sanding is necessary

Sanding has several purposes: removing loose material, flattening repairs, softening sharp coating edges and creating a mechanical profile on glossy surfaces. It should be controlled rather than treated as a universal demolition step.

Older homes require extra caution. Health Canada says homes built before 1960 probably contain lead-based paint, while homes built between 1960 and 1990 may still contain it, particularly on exteriors. Suspect coatings should not be aggressively dry-sanded or scraped without an appropriate assessment and control plan.

Primer is selected for a reason

Primer is not simply cheaper paint. It may be needed to seal porous repairs, block a stain, isolate an incompatible coating, support adhesion or provide a uniform base. A full coat of primer is not required on every sound repaint, but spot-priming repairs and bare areas is often essential.

The primer and finish must form a compatible system. Products should be selected from current technical data rather than from a generic rule that one primer works everywhere.

Exterior preparation in Niagara

Exterior surfaces add weather, height and moisture to the equation. Washing removes dirt, biological growth and chalk. Loose coating is removed, sound edges are feathered, open joints are assessed and bare areas receive the appropriate primer. Wood that is wet or deteriorated is not ready to coat.

Partially renewed deck showing weathered and prepared wood
A deck renewal from the Gillet archive showing the contrast between weathered and prepared wood.

Protection and sequence are part of preparation

Floors, furniture, hardware, adjacent finishes and working areas need a protection plan. The sequence matters as well. Repair dust should be removed before painting, caulking must be allowed to set as directed and coats need the specified recoat time. Rushing these steps can move the problem into the finished surface.

Questions to ask before accepting an estimate

  • Which repairs and cleaning steps are included?
  • Will glossy or failing coatings be sanded or otherwise prepared?
  • Where will primer be used, and what problem is it solving?
  • Are caulking, stain blocking and minor repairs included or excluded?
  • How will floors, furniture and adjacent surfaces be protected?
  • What conditions would require a change in scope after work begins?

A professional scope should make preparation visible rather than hiding it inside the word “painting.” Tell Gillet Painting about the condition of your surfaces, and include photographs when possible, to begin with a realistic assessment.

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stephan@gilletpainting.com
289-213-9920
49 Leaside Dr, St. Catharines, ON L2M 4G4
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