Garage floor epoxy in Melbourne is one of the few jobs where the difference between a good result and a failure is decided almost entirely before any coating goes down. Most failed floors were not coated with the wrong product. They were coated onto a slab that was never properly tested or prepared.
This guide covers what actually has to happen, why cheap kits lift, and how to judge a quote.
Why garage floor epoxy fails in Melbourne
Moisture in the slab. Concrete sitting on ground without an effective moisture barrier wicks water up continuously. A coating applied over it is pushed off from underneath, often in sheets, sometimes months later. This is the single most common cause and the one almost never tested for in a cheap job.
No mechanical preparation. A coating needs a profiled surface to grip. A smooth, power-trowelled slab gives it nothing to hold. Diamond grinding opens the surface; a quick clean and an acid wash usually does not do enough.
Hot tyre pickup. Warm tyres from a drive soften a poorly bonded coating and lift it off the slab when the car is parked. If you have ever seen tyre-shaped patches missing from a garage floor, that is what happened. It is a bond failure, not a product failure.
Contamination. Oil, grease and transmission fluid soaked into the concrete will stop any coating bonding over those spots.
Coating too soon after the slab is poured. New concrete needs to cure before it can be coated, typically around 28 days as a minimum, and longer in cold weather.
What proper preparation involves
- Moisture test. A simple plastic sheet taped down overnight will reveal obvious problems; a calcium chloride or relative humidity test gives a real reading. If the slab is wet, a moisture-tolerant primer or a different system is needed.
- Degreasing. Oil and grease removed, with heavily contaminated areas cut out if necessary.
- Diamond grinding. Mechanical profiling of the whole floor. This is noisy, dusty work and it is the stage that costs money and makes the job last.
- Crack and joint repair. Cracks cut out and filled with an appropriate repair product, control joints treated correctly.
- Priming. A primer suited to the substrate and the moisture reading.
- Coating. Base coat, optional decorative flake, then a clear topcoat.
- Curing. Light foot traffic typically after a day or so, vehicles considerably later. Driving on a coating before it has cured properly ruins it.
The main coating options
| Epoxy | Polyaspartic / polyurea | One-pack DIY kit | |
|---|---|---|---|
| Build and durability | High | High | Low |
| UV stability | Can yellow in sunlight | Good | Poor |
| Cure speed | Slower | Very fast, often same day | Slow |
| Working time | Reasonable | Very short, needs experience | Long |
| Typical use | Garage floors, workshops | Fast-turnaround and sunlit areas | Light-duty only |
| Cost | Moderate | Higher | Low |
Most residential garages are coated with an epoxy base and a protective topcoat. Polyaspartic systems cost more but cure fast and handle UV better, which matters if the garage door is open a lot or part of the floor gets direct sun.
The one-pack kits sold in hardware stores are not the same product category. On a properly ground and primed slab they will outperform their reputation, but they are usually applied over an unprepared floor, which is why they have the reputation they do.
Finishes
- Solid colour is the simplest and shows dust and tyre marks most.
- Flake or vinyl chip broadcast into the base coat hides marks and dirt far better and adds slip resistance. It is the most popular residential choice for good reason.
- Clear sealer over bare concrete is the cheapest option and suits a garage where you want dust control rather than a finished look.
What drives the price
- Floor area, and whether it is a single, double or tandem garage
- Slab condition: cracking, pitting, previous coatings to remove
- Moisture reading, which may require a more expensive primer system
- How much grinding is needed, particularly if an old coating has to come off
- Coating system chosen
- Flake coverage, as full-broadcast flake uses considerably more material than a light scatter
- Edge detail, steps, and whether the coating turns up the wall as a skirting
Removing a failed previous coating is the item that most often surprises people, and it is why it pays to get the first one done properly.
Questions worth asking
- Will you moisture-test the slab, and what happens if it reads high?
- How will you prepare the surface — grinding, or chemical etching?
- What primer, base coat and topcoat, by product name?
- How long before I can walk on it, and before I can park on it?
- What is the plan for existing cracks and control joints?
- Is there a warranty, and what does it exclude?
A contractor who leads with moisture testing and grinding is describing the job properly. One who quotes a price per square metre over the phone without seeing the slab is not.
Expert Painting and Renovation
Expert Painting and Renovation is a family-run, Aussie-local company based in Richmond with more than 9 years of experience across Melbourne homes and commercial properties. We assess the slab before quoting and tell you what preparation it actually needs rather than what makes the quote look cheapest.
We also handle interior painting, exterior painting and plastering, so a garage conversion or workshop fit-out can be done as one job. For commercial floors and line marking, see our commercial painting service.
See our portfolio, check coverage on our service areas page, or contact us.
FAQ
How long does a garage floor coating last? On a properly prepared, dry slab, a professional epoxy or polyaspartic system should last many years under normal domestic use. On an unprepared slab, it can start lifting within months.
Can you coat over an existing epoxy floor? Sometimes, if the existing coating is sound and well bonded. If it is lifting anywhere, it has to come off first, and removal is a significant part of the cost.
Why did my DIY kit peel off in tyre shapes? Hot tyre pickup, caused by inadequate bond. The slab was almost certainly not mechanically ground before coating.
How soon can I park on a new coating? Foot traffic usually after about a day; vehicles considerably longer, and your installer should give you specific times for the product used. Parking early is a common way to ruin an otherwise good floor.
Does a new concrete slab need to cure first? Yes. Fresh concrete needs time to cure and release moisture before coating, typically a minimum of around 28 days and longer in cold conditions.
About Expert Painting & Renovation
Expert Painting and Renovation is an Aussie-local, family-run company based in Richmond, Melbourne, with more than 9 years of experience in residential and commercial painting and renovation. Our specialists deliver premium workmanship, timely service and durable finishes designed for Melbourne homes.
- Ceiling crack repairs
- Sagging ceiling restoration
- Water‑damaged ceiling repairs
- Cornice replacement
- Full plastering services
- Interior & exterior painting
- Weatherboard restoration
- Deck & timber maintenance
- Roof painting
- Rendering & texture coating
- Commercial Painting
- Plastering Services
- House Painting
Whether you need maintenance advice, a single-room refresh or a full home makeover, our team is just a call away.
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