Why Garage Floor Paint Peels, And How To Fix It Properly

Read the pattern of failure

Turn a loose flake over. If the underside carries grey dust, the paint held on well; it was the top of the concrete that gave way. If it is clean and smooth, the paint never bonded properly in the first place.

Lifting under tyres

Hot tyre pickup; the film is too thin or poorly bonded for vehicle heat

Blisters and bubbles

Moisture or vapour from the slab pushing the coating up

Flaking with dust on the back

Laitance or a weak surface layer that was never removed

Patchy loss near stains

Oil, sealer or old coating stopping adhesion

Why hot tyres are so hard on thin paint

Tyres warm up on the drive home and soften a thin coating slightly when parked. As they cool they grip the film, and when the car moves off they can lift it. Hot tyre pickup is what strips thin DIY coatings. Installed resin builds resist it because they are thicker and bonded into a mechanically prepared surface rather than resting on it.

The repair sequence we follow

1. 1
   Remove failed material

   Anything delaminating comes off. Coating over a failing layer just means doing the job twice.

2. 2
   Grind or shot blast

   This removes laitance, residue and contamination and opens a sound profile.

3. 3
   Test moisture

   High readings mean a moisture tolerant primer or a different system.

4. 4
   Repair the slab

   Cracks, holes and spalls are filled so the new coating has a sound base.

5. 5
   Prime and coat

   A vehicle-rated epoxy or polyaspartic build is applied and left to cure before the car goes back in.

Mistakes that bring the peeling back

Oil soaked into concrete is another common trap. It can look cleaned but still stop the primer bonding in that patch, so it must be dealt with during preparation.

• ✓Rolling a new tin of paint over flaking paint
• ✓Washing or acid etching instead of mechanical preparation
• ✓Ignoring damp because the floor looks dry on the day
• ✓Parking the car before the coating has reached wheeled-use cure
• ✓Using a thin film where tyres turn on the spot

Is paint ever the right answer?

In a dry storage room with no vehicles, a simple painted finish can be proportionate. Once cars, hot tyres, oil and dropped tools come into it, a coating designed for them is the better long-term choice. For domestic garages the site publishes a 10 to 15 year life for a correctly prepared and specified epoxy or polyaspartic floor.

Looking after the new floor

Once the new coating has cured, keep grit off it with a regular sweep, because grit under tyres is what slowly dulls the surface. Wipe up oil and brake fluid rather than leaving them to sit. Use a pH neutral cleaner and avoid harsh solvents. Place a mat where tools are dropped or a trolley is parked often.

If the finish becomes worn after years of use, it can be abraded and re-topped rather than stripped, as long as the base remains bonded. Workshops and MOT bays commonly need re-topping after 5 to 8 years because of grit abrasion; domestic garages usually go much longer.