Epoxy Needed
3.2 gal
Area
400 ft²
Primer
1.3 gal
Cost
$417
400 ft²
3.2 gal
1.3 gal
$417
Inputs
Result
Epoxy needed: 5.0 gallons (400 x 2 / 160 = 5.0), Primer: 1.3 gallons (400 / 300), Color flakes: 48 lbs (400 x 0.12), Topcoat: 1.3 gallons, Total cost: approximately $1,072 for materials.
Inputs
Result
Epoxy needed: 10.7 gallons (1,200 x 2 / 225 = 10.7), Primer: 4.0 gallons (1,200 / 300), Color flakes: 60 lbs (1,200 x 0.05), Topcoat: 4.0 gallons, Total cost: approximately $1,300 for materials.
Inputs
Result
Epoxy needed: 11.25 gallons (600 x 3 / 160 = 11.25), Primer: 2.0 gallons (600 / 300), Color flakes: 48 lbs (600 x 0.08), Topcoat: 2.0 gallons, Total cost: approximately $1,285 for materials.
Coverage depends on epoxy type: water-based epoxy covers approximately 250 sq ft per gallon per coat, solvent-based covers about 200 sq ft/gal, and 100% solids epoxy covers roughly 160 sq ft/gal. Rough or porous surfaces will reduce coverage by 10-20%. For a typical 2-car garage (400 sq ft) with 2 coats, you'll need about 3-4 gallons depending on the epoxy type.
Most epoxy flooring projects require 2 coats for optimal results: one base coat and one finish coat. High-traffic commercial areas may benefit from 3 coats for added durability. Always apply a primer coat first (not counted in the coat total), and consider adding a clear topcoat for UV protection and chemical resistance, especially in garages or outdoor applications.
Water-based epoxy is easiest to apply, has low VOCs, and costs $30-60/gal but is less durable (5-7 years). Solvent-based epoxy offers better penetration and durability (7-10 years) at $50-80/gal but has higher VOCs. 100% solids epoxy is the most durable (10-20 years), has minimal VOCs, and costs $80-150/gal. It's thicker and requires more skill to apply but provides the best long-term performance.
| Epoxy Type | Coverage/Gal | Lifespan | Cost/Gal |
|---|---|---|---|
| Water-Based | 250 sq ft | 5–7 years | $30–$60 |
| Solvent-Based | 200 sq ft | 7–10 years | $50–$80 |
| 100% Solids | 160 sq ft | 10–20 years | $80–$150 |
Color flakes typically cost $6-10 per pound. For light coverage, use about 1 lb per 20 sq ft. Medium coverage requires 1 lb per 12-15 sq ft. Full broadcast (complete coverage) needs approximately 1 lb per 10-13 sq ft. For a 400 sq ft garage with full broadcast, you'll need about 30-40 lbs of flakes ($240-400). Flakes add texture, hide imperfections, and improve slip resistance.
| Flake Coverage | Rate (lb/sq ft) | 400 sq ft Garage |
|---|---|---|
| Light | 0.05 | 20 lbs ($160–$200) |
| Medium | 0.08 | 32 lbs ($256–$320) |
| Full Broadcast | 0.10–0.12 | 40–48 lbs ($320–$480) |
Several factors impact coverage: surface porosity (rough concrete absorbs more), ambient temperature (affects viscosity), application method (roller vs. squeegee), surface preparation quality, and epoxy viscosity. Porous or damaged concrete can reduce coverage by 20-30%. Always buy 10-15% extra material to account for waste, mixing errors, and touch-ups. Proper surface preparation with grinding or etching ensures better coverage.
While not always required, a clear polyurethane or polyaspartic topcoat is highly recommended. It provides UV protection (prevents yellowing), enhanced chemical resistance, improved scratch resistance, and easier cleaning. Topcoat is especially important for garage floors exposed to hot tire pickup, outdoor patios with sun exposure, and high-traffic commercial areas. It typically costs $40-60/gal and covers 300-400 sq ft per gallon.
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Last Updated: Mar 9, 2026
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