It's August in Austin. The pour is at 1 PM. The slab reads 108°F and rising. You mix Part A and Part B, pour the first ribbon, and by the time the second bucket is mixed, the first one has gone from a creamy liquid to a soft solid in the bottom of the pail. The kit is cooked. The pour is over.
Welcome to a Texas summer pour. This is the article we'd give you if you called us in July asking whether your garage floor project can wait until October.
Short answer: usually yes. Long answer below.
What "pot life" actually means
Pot life is the working window. It's the time between mixing two-component resin and the moment it's no longer fluid enough to apply. After pot life ends, the chemistry has progressed too far for the material to flow, level, or bond properly to the substrate. You can still pour it. It just won't perform.
Every two-part coating has a pot life, and every pot life on every data sheet is quoted at 75°F. That's a polite lab temperature. Real Texas job sites in summer are not 75°F.
The 18-degree rule
Here's the rule of thumb that matters: every 18°F increase in temperature roughly halves pot life.
For our RS Poly 90% Solids Polyaspartic, the published pot life is:
| Surface temperature | Pot life | |---|---| | 41°F | 45 minutes | | 68°F | 35 minutes | | 75°F | 30 minutes | | 90°F (estimated) | about 18 minutes | | 105°F (estimated) | about 10 minutes |
At 105°F, you have ten minutes from "stir paddle goes into the bucket" to "this material is no longer applying cleanly." That's the bucket-cooks moment. The exotherm (the heat the chemistry generates as it cures) compounds with the ambient heat, and once it starts running, it accelerates fast.
For epoxy, the curve is similar but starts longer. A 100% solids epoxy at 75°F gives you 45 minutes of pot life. At 95°F, expect closer to 20 minutes. At 105°F, you're at 10 to 12 minutes and the bucket gets hot enough to burn your hand.
What goes wrong above 95°F
Two things kill a hot-weather pour, and they happen together:
The bucket cooks before you can spread it. This is the obvious one. You mix three gallons, you pour two, the third gallon hardens in the bucket, you scrape a $200 brick of cured plastic into a trash bag.
The slab flashes the coating. A concrete slab that's been baking in the sun all morning hits 110°F to 120°F by noon. That hot slab evaporates the carrier solvent in the coating before the resin has a chance to wet into the surface. The result is cratering, fish-eyes, skid-mark whitening, or just a film that doesn't bond. By the time you see the problem, the coating is on the floor and you're committed.
Both problems compound. A hot slab plus a hot bucket plus humid Texas air equals a botched pour every time.
Strategies that actually work
Mix smaller batches. This is the single most important change. If your normal batch is three gallons, mix 1.5 in summer. Two smaller pours beat one half-set blob every time.
Stage your buckets. Don't pre-mix and let buckets sit in the sun waiting. Mix one, pour it, then mix the next. The chemistry doesn't pause for you.
Cool the components. Store unopened kits indoors at 70°F overnight before the pour. Cold A-side and cold B-side give you back five to ten minutes of pot life on a hot day. Don't refrigerate. Condensation is worse than heat.
Mix in the shade. A black 5-gallon bucket sitting in direct sun reads 130°F on its surface in fifteen minutes. Stage your mixing area under a pop-up tent or inside the garage with the door open.
Pour at sunrise. Start at 6 AM if you can. The slab has had all night to give up its heat, the air is the coolest it will be all day, and you finish the base coat before the worst of the heat arrives. We have customers in San Antonio who pour by headlamp at 5:30 AM in July. It works.
Track slab temperature, not air temperature. A surface thermometer (the infrared gun kind, $30 at any tool yard) is the most useful summer tool we know. The slab temperature drives pot life more than the air does. If the slab reads 105°F at start time, you're pouring on a heat sink that's actively warming the chemistry through the bucket.
Run the AC into the garage for an hour. If you have a window unit or a portable AC, blow cool air into the garage with the door cracked just enough to fit the hose. An hour of cooling drops slab temperature 10°F or more. Worth the electricity.
Switch from fast cure to standard cure. Fast-cure polyaspartic gives you 10 to 15 minutes of pot life at room temperature. In Texas summer heat, that drops to almost nothing. The standard cure gives you 30 minutes at room temperature, which is closer to 18 to 20 minutes in the heat. Worth the slower schedule. Don't try to use fast cure in summer unless you have a crew of three and a clear plan.
When to call it off
There's a temperature above which you should not pour, no matter how clever the strategy. Most polyaspartics and epoxies are rated to a maximum surface temperature of about 104°F. Above that:
- The exotherm runs away. The chemistry generates heat faster than it can dissipate, and the bucket can hit 130°F to 150°F internally.
- The film flashes too fast to self-level.
- You get cratering, fish-eyes, or skid-mark whitening on the surface.
- Adhesion to the slab degrades because the resin doesn't have time to wet the substrate before the carrier flashes off.
If the slab reads 105°F or higher at start time, push the pour. There is no clever recovery from a botched summer pour. You'll be grinding it off and starting over in October. Better to wait six weeks for fall.
When fall arrives, pour the floor
Most Texas garages get their floors done October through April for exactly this reason. The temperature window is forgiving, the humidity drops, and you don't have to fight the slab. We see a noticeable bump in kit orders the first cool weekend of October every year.
If you're set on a summer pour because the schedule won't wait (closing on a house, deadline for a guest visit, the homeowner is finally home from a deployment), follow the strategies above and pick a Saturday morning when the forecast doesn't peak above 95°F. It's doable. It's just harder than waiting.
Cold-weather notes
The opposite problem exists below 50°F. Pot life extends in the cold, which sounds like good news, but the cure also extends, and below the minimum spec'd temperature the chemistry stops crosslinking altogether. RS-POLY-90A is rated to 41°F minimum surface temperature. Below that, the pour technically happens but the cure never finishes. You end up with soft, uncured film that scrubs off the floor in the first month.
The full operating window for residential garage floor coatings:
- Below 41°F: don't pour, the chemistry won't crosslink
- 41°F to 50°F: pour with extra cure time and tight environmental control
- 50°F to 90°F: normal operating window, no special precautions
- 90°F to 104°F: small batches, early start, slab thermometer
- Above 104°F: don't pour, push the schedule
This is why fall and spring are the best pour seasons in Texas. The window is wide open and you don't have to fight either extreme.
What we ship with summer kits
When you order a polyaspartic kit between June and September inside our 200-mile delivery zone, we deliver in the morning and we deliver cool. Kits are stored indoors at 70°F, transferred straight from climate-controlled storage to the truck, and dropped at your job site before 10 AM. That gives you a fighting chance to start the pour before the slab cooks.
Same-day delivery to Austin and San Antonio, next-day to Houston, Dallas, Waco, and College Station.
FAQ
What is the highest temperature I can pour epoxy at?
104°F surface temperature is the published maximum for most 100% solids epoxies and polyaspartics. Above that, the chemistry runs away in the bucket and the slab flashes the coating before it can bond. Air temperature can be slightly higher as long as the slab is cooler.
Can I pour epoxy in Texas in August?
Yes, with three constraints: pour at sunrise, mix small batches, and use a slab thermometer to confirm surface temperature is below 95°F at start time. Most installers prefer to wait until October. If you can wait, wait.
Why does the bucket get hot during mixing?
The reaction between Part A and Part B is exothermic. Mixing them generates heat. Cool ambient temperatures dissipate that heat. Hot ambient temperatures trap it, and the bucket gets hotter and hotter until the chemistry runs away.
Can I cool the kit in the refrigerator before pouring?
No. Refrigerator-cold (35° to 40°F) is too cold and produces condensation on the resin surface, which contaminates the cure. Indoor room temperature (68° to 72°F) is the right pre-pour storage. Cool, dry, and stable.
What's the difference between fast-cure and standard-cure in summer?
Fast cure pot life drops to almost nothing in summer heat. A 10-minute pot life at 75°F becomes a 4 or 5 minute pot life at 95°F. Standard cure gives you a usable working window even in heat. We tell summer customers to skip the fast cure entirely.
My slab is 105°F. Can I cool it down?
Yes, with effort. Run the AC into the garage for an hour or two with the door cracked. Shade the slab with a tarp. Both methods can drop slab temperature 10°F to 15°F. Whether that's enough depends on starting conditions.
What if I pour and realize mid-job it's too hot?
Stop. The unfinished slab is going to look weird until you can come back and finish it (probably bridges between the two pours), but a botched pour will need to be ground off and redone. A bad seam can be sanded and topcoated. A burned bucket and a flashed slab cannot.
Bottom line
The window for pouring a polyaspartic or epoxy garage floor in Texas is wide, but summer afternoons are outside it. Pour early, pour cool, mix small. If the slab reads above 104°F, wait for October.
Send us your dates and we'll plan kit delivery and a pour window around the weather.