DIY versus a crew
Is doing it yourself actually cheaper?
The comparison separates three questions that should not be collapsed: cash outlay, the value you place on your own time, and the cash cost of a failed attempt. The failure threshold below is explicitly cash-only; it is not a prediction of failure or a recommendation.
Modeled comparison
DIY has the lower modeled cost before failure risk. Compare your own failure estimate with the cash-only threshold below.
$2,450 cash difference, for 27.0 hours of your labour
The arithmetic behind that verdict
- DIY saves $2,450 in cash against the quote entered, before pricing 27.0 hours of your time.
- After pricing your time, the modeled saving is $1,775 before failure risk.
- The cash-only failure threshold is 117 percent: cash saving divided by redo cost. It deliberately excludes the value of your time, which is reported separately above.
What the failure threshold does — and does not — say
The displayed threshold solves one narrow equation: cash saving equals failure probability multiplied by the redo cost. At the default figures it is 117%. The value of your hours is not in that threshold; it appears separately as “Saving after your time.”
Treat the threshold as a comparison point for a failure probability you assess yourself, not as evidence that a particular floor will succeed or fail. If the time-priced saving is already negative, the all-in comparison is negative before any failure risk is added.
A moisture test does not prevent moisture or guarantee adhesion. It supplies evidence that can stop an unsuitable coating plan before material is installed. Check the actual product warranty for its testing, preparation and moisture exclusions rather than assuming one warranty represents the market.
One thing the hours figure deliberately does not contain is waiting. Those are working hours — grinding, mixing, pulling and back-rolling — and they are the only hours this comparison should count, because the room is out of use for the full cure whoever does the work. A crew does not make resin harden faster. What a crew changes is how many of those elapsed days you personally have to spend on the slab, and the elapsed side of it is worked out on the cure schedule.
Price the redo at what a SECOND attempt would cost rather than at what the first one did: the grinding is harder the second time, because there is now a bonded coating to take off rather than bare concrete.
What a professional is actually selling
Not brushwork. Three things a weekend cannot easily buy:
- The machine and the tooling. A contractor arrives with a machine sized for the floor and the right diamonds for the concrete. A rental counter gives you whatever is on the shelf, and the tooling matters more than the machine.
- Crew size against pot life. Resin sets on a clock you do not control. Two people can pull and back-roll a bay that one person cannot finish before it gels, and that constraint sets the maximum area a solo attempt can cover — see the batch arithmetic.
- Having seen it go wrong. Most of the judgement in this trade is recognising a problem in the first ten minutes rather than the last ten. That is what you are paying for and it does not show up on a quote.
Where each answer genuinely wins
| Situation | Usually | Because |
|---|---|---|
| Small bare slab, foot traffic, solid colour | Do it yourself | Thin film, one pass of preparation, pot life is not a race at that area. |
| Two-car garage, flake, bare sound concrete | Genuinely either | The saving is real and the risk is manageable if the moisture test passes clearly. |
| Anything with an existing coating on it | Get a quote | Removal is the whole job and it is the part rental equipment does worst. |
| Any slab that failed or narrowly passed a moisture test | Get a quote | Mitigation products are unforgiving and the failure is total rather than cosmetic. |
| Metallic finish anywhere | Get a quote | The effect cannot be repaired locally, so a first attempt is a whole-floor commitment. |
| Quartz or any troweled build | Get a quote | It is a placed system with a crew, not a coating with a roller. |
Biggest swing factor The redo cost. It is the term most people leave out entirely, and it is the one that makes a thin saving a bad trade.