How to Paint Over Stains or Water Damage Properly

Water stains, smoke marks, and discoloration can bleed through fresh paint, no matter how many coats you apply—unless the surface is treated the right way. As a house painter in Edmonton, we’ve seen how common it is for homeowners to skip crucial prep steps and end up with yellowish blotches reappearing weeks later.

Here’s the clean, professional method we use to make sure the problem stays hidden for good.

1. Identify and Fix the Source of the Problem

Painting over an active leak is a waste of time.

  • Inspect the area for roof leaks, plumbing issues, or condensation problems.

  • Repair the source completely before starting any painting work.

  • Allow the affected area to dry fully—use fans or dehumidifiers if needed.


2. Clean and Remove Surface Contaminants

Stains often contain residue that prevents adhesion.

  • Gently scrub the area with warm water and mild detergent.

  • For smoke or nicotine stains, use a degreaser or TSP (trisodium phosphate) solution.

  • Rinse and let dry completely.


3. Scrape and Sand Damaged Paint

Loose or bubbled paint must be removed.

  • Use a paint scraper to remove flaking material.

  • Sand the area with fine-grit sandpaper to feather the edges into surrounding paint.

  • Wipe away dust with a damp cloth.


4. Apply a Stain-Blocking Primer (Non-Negotiable)

This is where most DIYers fail. Regular primer won’t stop stain bleed-through.

  • Use an oil-based or shellac-based stain-blocking primer for water marks, smoke damage, and tannin bleed.

  • Apply one even coat with a brush or roller, extending slightly beyond the stained area.

  • Let it dry according to manufacturer’s instructions—don’t rush this step.


5. Inspect and Re-Prime if Needed

Some heavy stains may need a second coat of primer.

  • Check for any visible discoloration.

  • Apply another primer coat only if necessary.


6. Paint with High-Quality Finish Paint

Once the primer has sealed the stain:

  • Use a premium interior paint for durability and even coverage.

  • Apply two coats for best results, allowing proper drying time between coats.


7. Prevent Future Staining

  • Control humidity with ventilation fans or dehumidifiers.

  • Address minor leaks quickly before they cause damage.

  • Schedule regular inspections if your home is prone to moisture issues.

Pro Tip from an Edmonton Painter

Water damage in Edmonton homes often worsens during freeze-thaw cycles. If you see recurring stains in winter, check attic insulation and ventilation to prevent condensation problems.

© Leonard's Painting Edmonton, 2024. All Rights Reserved.