FAIMENew Paint Looks Patchy or Bubbly? What Went Wrong, and How to Fix It
The colour is right, but once it dries the wall has shiny patches, faint stripes, darker blotches or small bubbles. It is one of the most common complaints about a new paint job, and it almost always comes down to what was under the paint, or how it went on.
Patchy, shiny or streaky paint is usually flashing: spots where the wall absorbed the paint differently, most often over unprimed patches and joint compound, or where wet paint was rolled over paint that had started to dry. Thin coats, one coat over a colour change, and touch-ups in satin or semi-gloss make it worse. Bubbles soon after painting usually mean the paint went on over dust, grease, damp or a hot surface, or was rolled on too thick. Bubbles that appear weeks or months later point to moisture behind the wall, which needs finding before repainting. The fix for flashing is to prime the patches, then repaint the whole wall corner to corner with a wet edge and two full coats.
What you are seeing, and what it usually means
Shiny or dull patches
Usually over filled holes, cracks and taped joints that were not primed. Joint compound soaks up paint differently from the painted wall around it, so the sheen dries different. Called flashing.
Stripes or bands
Lap marks: wet paint rolled over a section that had already started to dry, leaving a double layer. Common on long walls, in warm rooms, or when the painter stops mid-wall.
Blotchy or uneven colour
Not enough coats for the colour change, a thin or over-stretched coat, or paint from different batches not mixed together. Deep colours show this most.
Touch-ups that stand out
Touch-ups with a brush on a rolled wall, or in a satin or glossier paint, almost never blend. The patch shows as a different shine.
Bubbles soon after painting
Paint over dust, grease or a damp surface, a coat that was too heavy, a cheap or wrong roller cover, or painting in direct sun or high heat. Water-based paint over old oil-based paint without a bonding primer can also lift.
Bubbles weeks or months later
Moisture coming through from behind: a leak, condensation on an outside wall, or a bathroom with no exhaust. Repainting will not hold until the moisture is dealt with. See bathroom paint peeling and water stains on the ceiling.
How to fix it so the wall looks even
Find out why first
Check for damp, a leak or a missing exhaust fan before anything else. If moisture is the cause, painting again will fail again.
Scrape and sand bubbles
Cut out bubbles and loose paint, feather the edges smooth, and fill and sand where needed.
Clean the wall
Kitchens, hallways and around switches carry grease and hand marks that stop paint from bonding. Wash, rinse and let dry.
Prime every patch and repair
Spot-prime filled areas and joints with a drywall primer, or prime the whole wall if there are many repairs. Use a bonding primer over old gloss or oil-based paint.
Repaint the whole wall, corner to corner
Not just the patch. Keep a wet edge, roll in one direction to finish, and do not stop mid-wall. Two full coats, with the recoat time on the can respected.
Check it in raking light
Look along the wall with a light held flat to it, or in late-afternoon sun. If joints still show after priming and two coats, the wall needs a smoother finish underneath. See Level 5 drywall finish.
Write the room, brand, colour code and sheen on the lid. Touch-ups from the same can blend far better, and the colour code lets you remix it later. A good painter hands this over at the end of the job.
Where FAIME fits
Interior painting, drywall repair and finishing are self-performed FAIME scopes for custom homes, houses, condos and commercial buildings across Toronto, North York, Etobicoke, Vaughan, Woodbridge, Richmond Hill, Markham, Mississauga, Brampton and the wider GTA. When we take over a wall that already looks patchy, we find out why first, so the new coats do not fail the same way.
- $2M general liability · Active WSIB (Class G5) · 2-year workmanship warranty
- Sherwin-Williams, Benjamin Moore and Dulux coatings
Frequently Asked Questions
Why does my new paint look patchy?
Usually flashing: unprimed patches and joint compound absorb paint differently from the rest of the wall, so they dry with a different sheen. Lap marks from rolling over partly dried paint, thin coats and too few coats over a colour change also cause it.
What is paint flashing?
Spots or bands on a painted wall that look shinier or duller than the area around them. It happens where the surface absorbs paint differently, such as over unprimed repairs and drywall joints, or where a touch-up was made.
Will a second coat fix patchy paint?
Sometimes, if the cause is a thin first coat. If the patches are over unprimed repairs or joints, they need priming first, then the whole wall repainted corner to corner.
Why is my interior paint bubbling?
Bubbles soon after painting usually mean paint over dust, grease, damp or a hot surface, or too heavy a coat. Bubbles that appear weeks or months later point to moisture behind the wall, such as a leak or condensation, which has to be fixed before repainting.
Why do my touch-ups show?
Touch-ups rarely blend on satin or glossier paint, or when brushed onto a rolled wall, because they dry with a different sheen and texture. Flat and matte touch up best. Otherwise, repaint the wall from corner to corner.
Does FAIME fix patchy or failed interior paint in the GTA?
Yes. Interior painting, drywall repair and finishing are self-performed FAIME scopes across Toronto, Vaughan and the wider GTA. FAIME carries $2M general liability, is WSIB Active under Class G5 and gives a 2-year workmanship warranty. Site visits are free.
Want this looked at properly?
We come out, look at the actual condition, and put the scope in writing. No pricing is given before a site visit — and we will tell you if the work does not need doing.
$2M general liability · Active WSIB (Class G5) · 2-year workmanship warranty