Epoxy Needed
4 gallons
Area
400 sq ft
Primer
2 gal
Total Cost
$397
4 gal
2 gal
400 sq ft
$397
Inputs
Result
400 sq ft / 250 = 1.6, rounded up to 2 gal per coat × 2 coats = 4 gal epoxy. Primer: 2 gal. Etch: 2 gal. Flakes (light): 400/60 = 7 lbs. 3 roller covers. Cost: $220 + $90 + $30 + $21 + $36 = $397.
Inputs
Result
240 sq ft / 250 = 0.96, rounded up to 1 gal epoxy. Primer: 1 gal. Etch: 1 gal. 2 roller covers. Cost: $55 + $45 + $15 + $24 = $139.
Epoxy covers approximately 250 square feet per gallon for a single coat. A standard 2-car garage (400 sq ft) needs 2 gallons for one coat or 4 gallons for two coats. Always round up to the next whole gallon and add primer and etching solution separately.
| Garage Size | Area | 1 Coat | 2 Coats | Total Cost (DIY) |
|---|---|---|---|---|
| 1-Car | 240 sq ft | 1 gal | 2 gal | $200–$350 |
| 2-Car | 400 sq ft | 2 gal | 4 gal | $350–$550 |
| 3-Car | 600 sq ft | 3 gal | 5 gal | $500–$800 |
Yes, concrete must be etched or mechanically ground before epoxy application. Acid etching opens the concrete pores so epoxy can bond properly. Without etching, the epoxy coating will peel and delaminate within months, especially in garage environments with vehicle traffic.
Epoxy floor coating cures in stages: dry to touch in 12–16 hours, ready for recoat in 24 hours, light foot traffic in 72 hours, and full vehicle traffic in 7 days. Temperature below 55°F significantly slows curing and may prevent proper hardening.
| Stage | Timing | Notes |
|---|---|---|
| Dry to touch | 12–16 hr | Do not walk on it |
| Recoat | 24 hr | Must recoat within 48 hr for adhesion |
| Foot traffic | 72 hr | Soft-soled shoes only |
| Vehicle traffic | 7 days | Full chemical cure complete |
For a light decorative scatter, use about 1 pound of flakes per 50–75 square feet. For a heavy full-broadcast finish, use 1 pound per 20–25 square feet. A 400 sq ft 2-car garage needs 6–8 lbs for light and 16–20 lbs for heavy coverage.
DIY epoxy coating costs $1–$3 per square foot in materials, while professional polyaspartic or epoxy installation runs $6–$12 per square foot. A 2-car garage costs $350–$550 DIY versus $2,400–$4,800 professional. DIY is worth it if you properly prep the floor.
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Last Updated: Mar 9, 2026
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