Concrete Coating Guide: Epoxy vs Polyaspartic vs Polyurea
Key Takeaways
- Polyaspartic coatings cure in 2-4 hours and cost $7-$12 per sq ft.
- Epoxy is the lowest-cost system at $3-$7 per sq ft but UV-sensitive and indoor-only.
- Polyurea handles freeze-thaw and abrasion better than epoxy at $5-$10 per sq ft.
- Diamond grinding is the only acceptable prep method for high-traffic floors.
- Quality flake-broadcast systems carry 10-15 year warranties.
Cost Ranges
System comparison
Polyaspartic is the modern gold standard: UV-stable, walkable in 4 hours, driveable in 24, lasting 15-20 years. Epoxy is lowest cost but yellows in sunlight and cures in 5-7 days. Polyurea is three times stronger than epoxy and flexes in cold climates.
Why prep matters more than the coating
Diamond grinding is the only acceptable surface prep for high-traffic floors. Acid etching alone leads to peeling within 1-2 years. Reputable installers run a calcium chloride moisture test before coating any slab.
The installation process
Day 1: diamond grinding (4-6 hours), crack repair, base coat with full flake broadcast. Day 2: scrape flakes, apply clear topcoat. Walkable in 4 hours, full chemical resistance in 7 days.
Warranty
10-15 year warranty against delamination plus a 1-year touch-up guarantee. Confirm moisture testing is included and full-broadcast flake (not partial sprinkle) is used.
Project Timeline
Material Comparison
Full Guide
Frequently Asked Questions
How much for a garage floor?
2-car garage (400-500 sq ft): $2,800-$5,000 polyaspartic, $1,200-$3,000 epoxy.
How long does it last?
Polyaspartic 15-20 years. Polyurea 12-20. Epoxy 10-15 indoors.
Can I DIY?
Hardware store kits lack abrasion resistance and UV stability. They typically peel within 2-3 years.
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