What a box store garage floor kit leaves out, and what the redo costs

The instinctive comparison is the price printed on a box against the number at the bottom of a quote, and the conclusion writes itself. It is the wrong comparison, because the two are not the same product applied at different scales.

GLI Epoxy Flooring describes what is in most box store kits: water based epoxy, which bonds weakly to concrete, yellows in sunlight and starts peeling within one to three years under normal traffic. Epoxy Dudes makes the related point from the other direction, that professional epoxy is not a surface coating but a multi layer system that chemically bonds to concrete, and that the process involves grinding, repairs, priming, application and curing rather than opening a tin.

So the kit price and the quote price are not two offers for one job. One is a coat of paint that will look good for a season or two. The other is a system with a preparation stage that costs more than the material does. Whether that is worth it depends entirely on what you want the floor to do, but pretending they are interchangeable is how the redo happens.

A coating does not stick to smooth concrete. It sticks to concrete that has been opened up mechanically, so the resin can key into the surface rather than sit on it. In this market that means diamond grinding or shot blasting, and it is done with equipment that a homeowner does not own.

Polished Floors states that mechanical diamond grinding to a defined surface profile is the standard for both epoxy and polyaspartic in a Toronto winter, and that acid etching does not create a strong enough bond. GLI Epoxy Flooring gives the local reason: Toronto's freeze and thaw cycles and the road salt tracked in on tires are why contractors here insist on grinding instead of etching.

Most kits include an etching solution, because that is the only preparation a kit can ship. It cleans the surface and roughens it slightly. It does not produce the profile the system needs, which is why the failure, when it comes, is not a scratch or a stain but the coating separating from the slab in sheets.

A failed coating is worse than no coating, because the next crew has to remove it before they can start. That work is grinding too, only slower, and the material coming off has to go somewhere.

GLI Epoxy Flooring prices redoing a failed DIY epoxy kit professionally, including proper removal and grinding, at about $2,800 to $3,200 for a double garage. Set that against the published range for coating a bare double garage properly the first time. Toroo Epoxy Coatings prices a 400 to 500 square foot double car garage at $1,500 to $3,000, Armour Guard prices a 400 square foot double garage at $1,600 to $4,000, Epoxy Dudes prices a two car garage of 400 to 500 square feet at $3,000 to $4,000, and SurfacePro Epoxy Flooring, which operates under Cedarwood Development Group, prices a 400 square foot two car garage at $3,800 to $6,800 or more.

The removal, in other words, costs roughly what the whole job would have cost at the lower end of the market, and you still have to pay for the new floor afterwards. That is the actual arithmetic of the DIY route when it does not work out, and it is why the kit is a gamble on preparation rather than a saving on materials.

Hiring someone does not by itself buy you the preparation. It buys you whatever is in the scope, and the preparation is the easiest thing to leave out, because it happens before any visible work begins.

GLI Epoxy Flooring gives a threshold worth remembering: treat any quote under roughly $3 per square foot with caution, because that price usually means thin material or no real diamond grinding. The same source prices surface preparation for stains, paint, cracks or moisture as its own add on at $1 to $3 per square foot, which is the money a headline rate saves by omitting it.

Polished Floors puts the trade off in one sentence: a $5 per square foot polyaspartic job over an acid etched slab will fail before a $5 per square foot epoxy job over a properly ground slab. The chemistry on the label matters less than what happened to the concrete underneath it. So the question to ask a contractor is not which product they use, it is what profile they grind to and what happens if the slab tests badly.

There is a distinction this directory has to be careful about, and it is worth passing on. This site lists 221 businesses connected to floor coating in the Greater Toronto Area, and each one carries the category label Google Maps gives it rather than a label this site assigns. Most of those labels describe contractors: 150 records are labelled flooring contractor, 17 floor refinishing service and 14 concrete contractor.

Four records carry the label flooring store. A store that stocks coating product, flake blends and topcoats is a genuinely useful thing to have in a directory of this market, and it is not the same thing as a crew that will grind your slab and apply a system to it. Some businesses do both. The label alone does not tell you which, and this index does not treat it as proof either way.

The practical version: when you call a number off any directory, including this one, ask first whether they apply the coating themselves or supply the material. It takes one sentence and it saves the conversation where you describe your garage for ten minutes to somebody who was only ever going to sell you a pail. That is a limit of what public listing data can tell you, and naming it is more useful than pretending the categories are cleaner than they are.

None of this makes a kit worthless. It makes it a different product with a shorter horizon, and there are floors where that is exactly what is wanted.

A basement storage room that just needs to stop shedding dust, a workshop floor that will be covered in benches and racking, a garage in a house that is going on the market next spring: in each of those, the one to three years of service GLI Epoxy Flooring gives these kits is a reasonable trade at kit prices, so long as you make it with your eyes open and so long as nobody grinds anything off later.

The floors where it is the wrong call are the ones that have to last. GLI Epoxy Flooring reports that a properly installed epoxy floor lasts 10 to 20 years in a home and 5 to 15 years in commercial or industrial settings, depending on traffic. That is the gap you are choosing between, and the honest way to decide is to price both the kit and the redo, not the kit alone.