How to Vet an Orange County Epoxy Contractor: Red Flags Checklist

Orange County has 200+ contractors who'll quote you an epoxy floor. Maybe 30 of them will install something that lasts. Here's the 7-point screening checklist we'd use if we were hiring an epoxy contractor — and the red flags that mean walk away.

1. Are They Licensed, Bonded, and Insured?

California requires a C-15 (Flooring & Floor Covering) or C-12 (Earthwork & Paving) contractor license for commercial epoxy work over $500. Residential work is more flexible but a CSLB-licensed contractor is still the standard.

Verify yourself: California CSLB online lookup at https://www2.cslb.ca.gov. Search by business name; you'll see license number, status, and any disciplinary actions. Ask for current Certificate of Insurance (COI) for general liability ($1M+) and workers' compensation.

Red flag: contractor refuses to provide license number or COI. Walk away.

2. Do They Diamond Grind, or "Acid Etch"?

Acid etching is not surface preparation. Real coatings need ICRI CSP 2-3 surface profile achieved through planetary diamond grinding with HEPA dust capture. Ask:

• "What's your surface prep process?"
• "What ICRI CSP profile are you grinding to?"
• "What grit progression do you use?"

Red flag: answers like "we acid etch" or "we use a small grinder" or "your slab probably doesn't need much prep." Walk away.

3. Do They Test Moisture Vapor?

OC's coastal humidity drives 3-5 lbs of moisture vapor per 1,000 sq ft per 24 hours through unsealed slabs. Coatings without moisture-block primer fail in those conditions.

Ask: "How do you test moisture vapor before coating?"

Acceptable answers: calcium chloride test (ASTM F1869), RH probe (ASTM F2170), or both.

Red flag: "we don't usually test" or "your slab looks dry." Walk away.

4. What Chemistry Do They Use?

OC garages need polyaspartic-over-epoxy hybrid systems for cost-effective UV stability and hot-tire resistance. Outdoor surfaces need full polyaspartic. Industrial floors need 100% solids epoxy with appropriate top coats.

Ask: "What's the brand and product spec for the base coat? The top coat? Are they 100% solids?"

Red flag: generic answers like "epoxy" with no brand, or solvent-borne kits sold as professional systems. Reputable contractors carry Penntek, Polyaspartic.com, Citadel, ArmorPoxy, or similar named brands.

5. Is the Quote Itemized and Written?

A real quote breaks out:

• Square footage measured
• Surface preparation (diamond grind specifically)
• Repair work (cracks, pits, joints)
• Moisture barrier primer (if needed)
• Base coat product and thickness
• Decorative layer (flake, quartz, metallic)
• Top coat product and number of coats
• Warranty terms
• Total fixed price (not hourly)

Red flag: phone-only quote, single-line "garage floor coating $X" with no detail, hourly billing, or "we'll see how it goes." Walk away.

6. What's the Warranty?

Read the warranty document at the quote stage, not at signing. It should specify:

• Lifetime or 10+ years
• What's covered (peeling, hot-tire, UV)
• What's excluded (specifically, not vaguely)
• Remedy (re-coat at contractor cost, ideally)
• Transferability

Red flag: verbal-only warranty, vague exclusion clauses, material-only remedy, non-transferable. See our separate post on warranty fine print.

7. Reviews, References, and Time in Business

Cross-check three sources:

• Google reviews — look for 4.5+ stars across 50+ reviews, with detail in the comments
• Yelp — same threshold; Yelp tends to surface complaints faster than Google
• BBB — accreditation isn't mandatory but check for unresolved complaints

Ask for 3 recent customer references in your area — not testimonials on the website, actual phone numbers you can call. Real contractors will provide them; fake ones won't.

Red flag: under 25 reviews total, average below 4.0, refusal to provide references, less than 3 years in business. Higher risk; not auto-disqualifying but raises the bar on the rest of the checklist.

The Hardest Red Flag to Spot: Pricing Too Good

If a contractor quotes 50% below the rest of the market, ask why. The honest answers (volume discount, slow season, you're a previous customer) are rare. The dishonest answers (skipping prep, using DIY-grade chemistry, no moisture testing) are common.

Median OC 2-car garage with polyaspartic-over-epoxy and lifetime warranty: $2,800-$3,800. If you're seeing $1,200-$1,800, ask exactly what's being skipped. Then check the warranty terms.

The Print-It Checklist

• ☐ CSLB license number provided and verified
• ☐ COI on file for $1M+ general liability and workers' comp
• ☐ Diamond grinding to CSP 2-3 with HEPA dust capture
• ☐ Moisture vapor test (calcium chloride or RH probe)
• ☐ Named-brand chemistry (Penntek, Polyaspartic.com, Citadel, etc.)
• ☐ Itemized written quote with fixed price
• ☐ Written warranty with clear remedy
• ☐ 4.5+ stars / 50+ reviews on Google
• ☐ 3 recent customer references provided on request
• ☐ 5+ years in business

Hit 8/10 of these and you've found a legitimate contractor. Hit fewer than 6 and keep looking.