A brand new floor with blisters in it is the single most common coating failure we get called about, and it is almost never bad product. It is a slab that was not read correctly before the coating went down.
Everything else is a variation of these. Either moisture is pushing up out of the concrete, or air is pushing up out of the concrete. Both of them move in the same direction, through the wet coating film, and both of them leave the same thing behind: a dome, a blister or a field of tiny pinholes.
Your slab sits on dirt. Dirt holds water, and that water moves up through the concrete as vapor, continuously, forever. A bare slab lets it evaporate off the surface and you never notice. Put a sealed film over the top with nothing underneath to stop the vapor and it collects at the coating line and pushes.
This is the failure that shows up months or years later, not on day one. It starts as a soft spot, becomes a blister, and ends with sheets of coating lifting, usually in the middle of the floor or wherever the slab is coldest. It is the reason a moisture vapor barrier is the layer that matters most and the layer most often skipped.
Some slabs push far more vapor than others. Newer construction on clay, anything poured without a plastic vapor retarder under it, walk-out basements and garages built into a hill are all worth testing. A calcium chloride or relative humidity test before quoting tells you whether a standard build is enough or whether the floor needs a heavier moisture-mitigating primer.
Concrete is full of tiny air pockets. When the slab warms up, that air expands and comes out. If it comes out while your coating is still liquid, it blows thousands of small holes through the film and they cure that way.
This is a same-day failure and it is entirely about timing. A slab that is cold in the morning and warming through the afternoon is outgassing the whole time. Coat it on the upswing and you get pinholes. Coat it while the slab temperature is flat or falling and the air stays where it is. Spring and fall are the worst for this because the daily temperature swing is biggest.
The other half of this is dew point. If the slab is colder than the dew point of the air in the garage, moisture is condensing on the surface you are about to bond to. You cannot see it and the coating will not stick to it properly.
None of that is exotic. It is a thermometer, a forecast and a decision about what time to start. The reason it gets skipped is that it sometimes costs a crew the day.
Pinholes from outgassing can usually be sanded and recoated, and if the underlying bond is sound the repair holds. Blisters from moisture vapor are different. Recoating over them puts a new film over the same problem and it will blister again. That floor has to come off and go back down with a proper vapor barrier, which is why it is so much cheaper to get right the first time.
If a company tells you bubbling is rare, out of their control and just the weather, ask them what the slab temperature was that morning. That is the whole answer.
No. A properly installed floor comes out smooth. A few isolated pinholes can be sanded and spot-repaired, but a field of them or any raised blister means something went wrong with moisture or timing, and you should get it looked at while it is new rather than waiting.
Tape a two-foot square of clear plastic to the bare concrete and seal all four edges. Leave it 24 hours. If there is condensation under it or the concrete beneath is visibly darker, you have vapor movement. That is a rough check, not a number. A calcium chloride or in-slab RH test gives the actual reading.
If the bubbles are from moisture vapor, yes, because the cause is under the coating. If they are surface pinholes from outgassing and the coating is still bonded everywhere, it can often be ground, filled and recoated.
Tell us the room, the rough size and your town. You get a written price, not a two-hour pitch. Fastest way is to text a photo of the floor to (815) 585-1750.
