Guide
How Much Polyaspartic for a 2-Car Garage?
Polyaspartic covers more ground than epoxy but a full flake floor uses two coats — a base and a topcoat — so the gallons add up. Here's how much polyaspartic a 2-car garage needs, with the coverage math.
- Polyaspartic covers roughly 106–162 sq ft per gallon (~130 average). A 3-gallon kit covers about 360–390 sq ft per coat.
- A full flake floor is two coats (base + topcoat), so a 400 sq ft garage needs ~6 gallons total before rounding.
- Add flake by broadcast density — about 40 lb at medium, up to 80 lb at full refusal for 400 sq ft.
Quick answer: polyaspartic by garage size
Gallons for a two-coat (base + topcoat) flake system at ~130 sq ft per gallon, per coat. Round each up to whole kits.
| Garage | Sq ft | Per coat | Two coats (total) | Flake (medium) |
|---|---|---|---|---|
| 1-car (12×20) | 240 | 1.8 gal | 3.7 gal | 24 lb |
| 2-car (20×20) | 400 | 3.1 gal | 6.2 gal | 40 lb |
| 2-car (24×24) | 576 | 4.4 gal | 8.9 gal | 58 lb |
| 3-car (30×24) | 720 | 5.5 gal | 11.1 gal | 72 lb |
Why the coverage range is so wide
Polyaspartic data sheets list anywhere from 106 to 162 sq ft per gallon. The high end is a thin clear topcoat on a smooth slab; the low end is a pigmented base coat or a rougher floor that drinks more material. When in doubt, plan for the middle (~125–135) and round up.
Worked example: 400 sq ft full-flake floor
- 1Base coat: 400 ÷ 130 = 3.1 gal → one 3-gallon kit (plus a touch more for a heavy broadcast).
- 2Broadcast flake to refusal: 400 × 0.20 = 80 lb → two 50-lb boxes.
- 3Topcoat: 400 ÷ 130 = 3.1 gal → one 3-gallon kit.
- 4Total polyaspartic: ~6.2 gal → two 3-gallon kits.
Size any polyaspartic job in 3 minutes
CoatBid handles single-coat, two-coat, and flake systems — exact gallons rounded to kits, flake by density, plus labor and price.
Frequently asked
A 400 sq ft 2-car garage with a two-coat flake system needs about 6 gallons of polyaspartic total (roughly 3 per coat at ~130 sq ft/gal), plus 40–80 lb of flake depending on broadcast density. Round up to whole kits.
Roughly 106–162 sq ft per gallon, averaging around 130. A 3-gallon kit covers about 360–390 sq ft per coat. Pigmented base coats and rough slabs land at the lower end.
A durable flake floor is typically two coats — a base coat that the flake is broadcast into, then a clear topcoat that locks it down. Some single-broadcast systems exist, but two coats is the common professional build.