Before You Coat Your Concrete Floor, Read This First
So you’ve got a bare concrete floor. Maybe it’s the garage, maybe the workshop, maybe that patio out back. It’s dull, it stains if you look at it wrong, and you’re tired of sweeping up dust that never really goes away. You’ve seen those glossy epoxy floors on Instagram and thought, “How hard can it be?”
Honestly? Harder than it looks. A lot of people slap down a DIY kit and end up with a mess that peels up in six months. This guide is about what actually matters-the prep nobody tells you about, the stuff that goes wrong, and when to just call someone who does this for a crust.
Why can't I just paint over the concrete and be done?
Concrete looks rock solid, but it’s fussy as hell when you want something to stick to it.
The biggest reason new epoxy floors fail isn’t the product. It’s the prep. If the surface isn’t clean, dry, and roughed up properly, the coating won’t bond. You’ll get peeling, bubbling, and a floor that looks worse than when you started.
Here’s the stuff standing in your way:
- Dust. Concrete sheds fine dust constantly. Any coating laid over dust sticks to the dust, not the floor. Then it lifts.
- Oil and grease. Cars, mowers, bikes-they drip. That oil soaks deep. Epoxy won't bond to an oily patch, ever.
- Moisture. Concrete sits on the ground. Water creeps up from underneath. If you seal it in, it pushes the coating off. Bubbles first, then flakes.
- Old sealers or paint. If someone put a sealer down years ago, your new epoxy will stick to that old layer, not the concrete. You've got to grind it all off.
A quick sweep and a mop isn’t prep. That’s just cleaning. Prep means grinding or shot-blasting the surface open.
Did You Know? Concrete can feel bone dry and still have moisture rising from underneath. Trap that moisture under a sealed floor and it’ll push up, form bubbles, and eventually lift the whole coating. A simple plastic sheet test-tape down some plastic for 24 hours, will tell you if you’ve got a moisture problem before you waste a cent.
What's the right way to do it then?
If you want an epoxy flooring finish that lasts years and not months, you follow a process. Skip a step and you’ll pay for it later.
Here’s the real order of things:
- Grind or shot-blast the floor. This opens up the concrete pores so the epoxy can bite. Acid washing is old-school and way less reliable. Don't cheap out here.
- Patch cracks and divots. Epoxy won't hide flaws. It highlights them. Fill every little chip.
- Check for moisture. Tape a piece of plastic to the floor. If condensation forms under it after a day, you've got moisture trouble. Deal with that first.
- Primer goes down. Primer seals the surface, stops air bubbles, and helps the topcoat stick. Skipping it saves a few bucks and ruins the job.
- Base coat of epoxy. This is the colour coat. You pour, spread, and roll it out. Decorative flakes go on now if you want them.
- Topcoat or clear sealer. This protects the colour, adds UV resistance if sunlight hits it, and gives you the gloss or satin finish.
Every step is there because someone skipped it once and learned the hard way. Primer stops bubbles. Grinding stops peeling. Moisture testing stops the whole floor from lifting. None of this is optional
Should I just grab a Bunnings kit or what?
Look, I’m not saying DIY kits are rubbish. For a small shed floor that barely gets used, they’re fine. But if you’re doing a double garage, a workshop, or an alfresco area where you actually live, there’s a big gap between a $200 kit and a pro job.
- Thickness. DIY kits go on thin. Pro-grade epoxy is thicker and more durable. Thicker means it handles hot tyres, dropped tools, and foot traffic without wearing through.
- Prep tools. A pro brings a concrete grinder that costs thousands. You're stuck with a rented one or a bit of acid etch. Guess which works better.
- Finish. Pros can add anti-slip texture, metallic effects, or custom flake blends. A kit gives you basic grey and a roller.
- UV stability. Standard epoxy yellows in sunlight. A pro will use a UV-stable topcoat. That matters if your floor sees any sun.
If your floor gets real use, getting a specialist in for epoxy flooring means you do it once. DIY it and you might be redoing it next year. That’s not saving money.
Pro Tip
After the epoxy’s down, don’t get impatient. It feels dry after a day, but it’s still soft for about a week. No parking the car on it, no dragging heavy boxes. Let it cure fully or you’ll leave permanent tyre marks and scratches that can’t be fixed.
Where do painters come into this?
You might think painters just do walls and ceilings. Plenty of them do floors too. The skills carry over; surface prep, clean edges, applying finishes evenly. They understand how coatings behave and how to get a flawless result.
Good painters in Shellharbour who also handle floor coatings can take care of the whole mess from start to finish. Grinding, patching, priming, coating, sealing. One crew, one headache, one clean result.
WM Painting and Decorating works right across Illawarra, and South Coast. So whether you’re in Bowral, Wollongong, or down in Nowra, it’s the same team. That’s handy when you want someone local who knows what the coastal air does to concrete versus the cold inland climate.
Stuff people forget to ask before they start
Most folks don’t think of these until something’s already gone wrong. Ask early.
- "Will this floor be slippery when it rains?" If it's outdoors or a garage that gets wet, you need anti-slip in the topcoat. Glossy epoxy plus water equals an ice rink. Don't find out the hard way.
- "Can I pick any colour?" Pretty much. Solid colours, metallic finishes, coloured flakes. You can match your walls or go for something that hides dirt (dark grey's good for that).
- "Does epoxy handle the sun?" Not really. Standard epoxy yellows in UV light. If your floor gets sun, you need a UV-stable topcoat or a different coating like polyaspartic.
- "How long before I can use the space?" Light walking after a day. Car after about a week. Plan around that or you'll mess up the finish.
Getting these answers now saves you from staring at a ruined floor later, thinking “why didn’t anyone warn me?”
Which spots benefit most from a coated floor?
Any concrete that you actually use. But some places see a bigger difference.
- Garages. The classic. Epoxy laughs at oil drips, petrol spills, and hot tyres. Sweeping it clean takes a minute, not an hour.
- Workshops. You drop tools, spill solvents, drag heavy stuff around. A coated floor can take it. Raw concrete gets chewed up and stained fast.
- Patios and alfrescos. A coated floor ties the space together and makes it feel like an outdoor room, not an afterthought. So much easier to keep clean than bare concrete.
- Basements and laundries. Moisture-prone spots need a barrier, but once sealed, they stop smelling damp and actually look finished.
- Shops and showrooms. That glossy, pro look you see in showrooms? It's usually epoxy or polished concrete. Customers notice.
If you’ve been staring at sad grey concrete in any of these places, you’re putting up with a surface that’s harder to clean and uglier than it needs to be.
Key Takeaways
- Prep is the whole game. Grinding, moisture checks, and primer aren't optional.
- DIY kits work for tiny, low-use sheds. Busier floors need a pro job.
- Proper epoxy flooring is a multi-layer system, not one thin coat from a bucket.
- Skilled painters in Shellharbour who do floors can handle the lot, from dust to final shine.
- Always ask about slipperiness, UV exposure, and curing time before anyone picks up a grinder.
Frequently Asked Questions
Only if you grind off the old paint first. Going over old coating is a gamble you’ll almost always lose.
A good job should give you 10 to 15 years without major problems. Less if it’s abused or badly prepped.
With a UV-stable topcoat and anti-slip, yes. Without them, it’ll yellow and become dangerously slippery.
Polyaspartic cures faster, handles UV better, but costs more. Epoxy’s great inside. Both can work.
Absolutely. Everything out. You need full access to grind and coat. Plan a clear weekend and a week of curing.
Final Thoughts
Coating a concrete floor looks simple on a five-minute video. The reality? It’s 90% prep, 10% coating. Skimp on the boring prep stuff and you’ll be staring at peeling flakes within a year, kicking yourself.
If you’re in Shellharbour, the Highlands, Illawarra, or down the South Coast and want a floor that actually lasts, the crew at WM Painting and Decorating can sort you out. We do epoxy flooring properly, and our painters in Shellharbour know how to make a floor look sharp without cutting corners. Give us a yell and let’s chat about your concrete.