Pot Life and Working Time: How to Plan Batches by Temperature
B-707 High Build Epoxy gives you 30 to 50 min of working time per 1.5 gal batch at about 70°F. B-181 cold-weather epoxy gives 16 to 26 min, B-933 polyurea 15 to 25, T-444X polyaspartic 10 to 20 usable and T-344 fast polyaspartic 5 to 10. Those numbers shrink as the floor gets warmer and as the batch gets bigger.
Working time by product
Working time is the window between finishing the mix and the point where the material stops leveling and the roller drags, given at about 70°F for the batch size in parentheses. Pot life is the same idea measured in the bucket, and it is always shorter than the time you get once the material is spread thin.
| Product | Mix | Working time at about 70°F (batch) | Rule for the floor |
|---|---|---|---|
| B-707 High Build Epoxy | 2:1 | 30 to 50 min (1.5 gal) | One 3 gal kit per bay, two people |
| B-181 Quick Set Epoxy, Cold Weather | 2:1 | 16 to 26 min (1.5 gal) | Half kits, two people |
| B-933 Fast Cure Polyurea | 4:1 | 15 to 25 min (150 g) | Half kits, two people |
| P-707LVP High Build Epoxy Primer | 2:1 | 35 to 55 min (1.5 gal) | One 3 gal kit per 600 sq ft |
| P-181LVP Quick Set Primer, Cold Weather | 2:1 | 26 to 38 min (150 g) | Half kits |
| P-015 Water Based Epoxy Primer | 4:1 | 60 to 90 min | Whole kit |
| C-671 Clear Epoxy | 2:1 | 20 to 30 min (1.5 gal) | Half kits on metallic floors |
| C-137MLV Chip and Quartz Binder | 2:1 | 35 to 55 min (1.5 gal) | One 3 gal kit per bay |
| T-444X Polyaspartic, Gloss | 1:1 | 10 to 20 min usable; 120+ min to gel | Half a 2 gal kit, one person rolling |
| T-344 Polyaspartic, Fast Cure | 2:1 | 5 to 10 min usable; 30 to 60 min to gel | Quarter to half kits, installer crew |
| T-521 / T-520 Water Based Polyurethane | 2:1 | 60+ min (150 g) | Whole kit; cover the pail, it skins |
| T-322 / T-322S VOC Compliant Urethane | 2:1 | 120 to 240 min | Whole kit |
| T-321 / T-320 High Performance Urethane | 2:1 | 120 to 300 min | Whole kit |
| T-359 High Wear Urethane | 3 parts by weight | 1 to 2 hr (1 gal) | Whole kit, pre-measured |
| U-903 Urethane Cement | by weight | 15 min at 77°F | One unit, installer crew |
| R-818 Epoxy Crack Filler | 1:1 | 60 to 180 min (2 gal) | Whole kit |
Where the batch is blank, the product page gives none. Specs as of November 2026. Recoat and cure times for the same products: recoat windows and cure times chart.
Two things shorten working time
Mass: a full bucket sets faster than a thin film
Epoxy cures by an exothermic reaction. Heat released in the center of a 3 gal mass has nowhere to go, so the center gets hotter, which speeds the reaction, which makes more heat. Spread the same material at 14 mils on a slab and the heat dissipates into the concrete.
Pour mixed epoxy out right away and never let a mixed kit sit in the bucket. The listed figures are for 1.5 gal of B-707 or 150 g of B-933; a full 3 gal kit sitting in the pail has less time than the listed range.
Temperature: warmer slab, warmer air, warmer cans
Working time shortens as the slab, the air and the material get warmer, and lengthens as they cool. The listed range already spans a cool slab (long end) and a warm one (short end). At 85°F and above, plan on B-707 at 30 min or less, B-181 at 16 or less, and the polyaspartics at the point where one person cannot keep up. Kits stored in a hot truck start the reaction warm; kits stored in a 50°F garage start slow.
Batch planning for a garage floor
Two people, one 3 gal kit of B-707 per car bay. One person mixes, pours and squeegees; the other back-rolls and, on a flake floor, broadcasts. One person can handle one bay.
- Stage every kit, bucket, roller cover and flake box before you open anything. Have the next kit open and Part A stirred while the current batch goes down.
- Mix one kit: pour all of Part B into Part A, run the drill wand 5 min at low speed, scraping the sides and bottom, then pour into a second clean bucket and mix 1 min more. The B-707 data sheet calls for a transfer pail and remix. Use a fresh 5 gal mix bucket for each kit; cured residue in a reused bucket seeds the next mix.
- Pour the whole batch out in ribbons across the floor, starting at the wall farthest from the door, and spread with the 18 inch notched squeegee. The 1/8 inch notches meter B-707 to about 14 mils so the 3 gal kit lands at 350 sq ft.
- Keep a wet edge: mix the next kit as the last one goes down and pour it against the previous ribbon before that ribbon starts to set. Flake floors: broadcast into each section right after it is back-rolled.
If you must stop mid-floor, stop at a straight line at a control joint or a taped line, let it cure, sand the edge the next day and continue. Order the next size up when the floor is near the top of a kit's range so you never have to. Spreading, back-rolling and cutting in: how to epoxy a garage floor.
Hot-weather tactics (slab above 85°F)
- Coat at dawn, when the slab is coolest and still falling; a warming afternoon slab pushes air out of its pores into the wet coat.
- Keep kits at 70°F, inside the house the night before. Mix half kits and add a third person to roll.
- Shade the door opening. Skip B-181 and T-344 in heat; their short windows get shorter.
Cold-weather tactics (slab below 60°F)
- Switch the base coat. B-181 applies to 45°F with 16 to 26 min of working time and recoats in 6 to 8 hr. P-181LVP is the matching primer at 45°F with 26 to 38 min. B-933 polyurea applies to 40°F, T-444X and T-344 to 50°F.
- Store the kits at 70°F so the reaction starts on time, heat the space with electric heat, and expect the long end of every cure range. Methods: applying epoxy below 60°F or above 85°F.
Common questions
What is the pot life of B-707 epoxy?
B-707 gives 30 to 50 min of working time per 1.5 gal batch at about 70°F. Mix one 3 gal kit at a time and pour it out as soon as it is mixed.
Does temperature change epoxy pot life?
Yes. Working time shortens as the slab, the air and the cans get warmer. At 85°F plan on the short end of every range and mix half kits.
How much epoxy should I mix at one time?
One 3 gal kit of B-707 per car bay with two people. Half kits for B-181, B-933 and the polyaspartics.
The one-day sequence is in how to install a one-day polyaspartic garage floor. Every order includes a free 20-minute consultation to go over batch sizes for your crew and your weather: (877) 703-7699, Monday to Saturday, 8am to 6pm ET.
