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FREE SHIPPING ON ALL ORDERS $500 OR MORE
Carbozinc 11 coating by Carboline

Carbozinc 11

by Carboline
$292.27 - $1,523.25
$292.27
$292.27 - $1,523.25
$292.27
Carbozinc 11, a Carboline product, is an inorganic zinc-rich primer designed for superior corrosion protection of steel substrates. Comprising 85% zinc dust in a silicate binder, it provides galvanic protection by sacrificially corroding to safeguard the underlying steel. This two-component coating, blending a liquid silicate with zinc powder, cures into a durable, adherent film suitable for harsh environments, including marine, offshore, and industrial applications. It withstands temperatures up to 750°F (400°C) and offers exceptional longevity, often extending service life for decades when topcoated.

PDS Sheet>

CARBOZINC 11 IS AVAILABLE IN A 1-GALLON KIT, INCLUDING PARTS A & B.
Use Carboline Thinner #33 with Carbozinc 11

If your project requires another Carboline coating product or a specific color not found here, please don't hesitate to speak with our customer support team. 

Contact our customer support today to discuss your project: 
(800) 567-5358

Color: Green 0300
Kit Size: 1-Gallon
Coverage Calculator

Compatible Thinners

Thinner Conditions Notes
Thinner No. 33 Normal conditions Standard thinner — most applications
Thinner No. 254 Hot / windy conditions Slow-evaporating; prevents early skinning above 85°F
Thinner No. 21 / No. 237 Cool / low-humidity For application below 55°F or RH <40%

⚠️ Use of unauthorized thinners may void the manufacturer's warranty. Consult Carboline TDS for exact thinning ratios.

Recommended Coating Systems

Marine / Offshore — Full 3-Coat System
Zinc Primer Carbozinc 11 2–3 mils DFT
→
Mist Coat + Intermediate Carboguard 890 Mist first, then 4–6 mils
→
Topcoat Carbothane 134 HG 2–3 mils DFT
⚠️ Mist coat required before full intermediate coat. Apply a thin mist coat of CG890, allow brief flash-off, then apply the full wet coat. Skipping the mist coat causes pinholes from IOZ outgassing.
Structural Steel — Standard Three-Coat
Zinc Primer Carbozinc 11 2–3 mils DFT
→
Intermediate Carboguard 60 4–6 mils DFT
→
Topcoat Carbothane 134 HG 2–3 mils DFT
Faying Surface (Class B Slip)
Single Coat — No Topcoat Carbozinc 11 2–3 mils · Class B certified

Frequently Purchased Together

Carboline Thinner No. 33
Standard Thinner
Carboline Thinner No. 33
Primary thinner for CZ11 under normal conditions. Required for spray & brush.
$137.22
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Carboguard 890 Epoxy
Intermediate Coat (Mist Coat)
Carboguard 890
Required intermediate over CZ11 in marine & heavy systems. Apply mist coat first to prevent outgassing.
From$419.48
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Carbothane 134 HG
Finish Topcoat
Carbothane 134 HG
UV-stable polyurethane finish coat. Final layer in CZ11 marine and structural systems.
From$292.27
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Carboguard 893 Epoxy Primer
Intermediate (Alternative)
Carboguard 893
Corrosion-resistant epoxy intermediate for use over CZ11 in 3-coat marine systems.
From$439.48
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Carbozinc 11 Inorganic Zinc Primer by Carboline

Product Specs — Carbozinc 11

Carbozinc 11 — Inorganic Zinc-Rich Primer (Silicate Binder) by Carboline.
One of the industry's most trusted IOZ (inorganic zinc) primers. Provides galvanic cathodic protection for structural steel with outstanding heat resistance up to 750°F. SSPC Paint 20 Type I Level 1 certified. Class B slip coefficient for faying surfaces in bolted connections. Available in 1-gallon and 5-gallon kits.

✓ SSPC Paint 20 Type I Level 1  •  ✓ ASTM D520 Type II Zinc Dust  •  ✓ Class B Slip Coefficient (faying surfaces)  •  ✓ Heat Resistant to 750°F (400°C)

✏️ Need a project quote? Request Online

📞 Questions? Call (800) 567-5358 — Mon–Fri 8AM–5PM EST

Carbozinc 11 by Carboline

Carbozinc 11 inorganic zinc-rich primer by Carboline — 1-gallon and 5-gallon kits
Carbozinc 11 — 1-Gal & 5-Gal Kits (Liquid Base + Zinc Powder)

Shipping Map — Carboline Delivery Timing

US regional warehouse map showing estimated shipping transit times for Carboline product orders from Material Warehouse 🔍 Click to enlarge
Typical transit times vary by destination zone. Click map to enlarge.

Shipping Time

Call (800) 567-5358 for pricing and logistics questions.

Carboline orders ship from regional warehouses nearest to your location, with full product stock maintained at each facility.

Most orders ship within 2–3 business days of order placement. Transit times shown on the map are typical but not guaranteed.

Available sizes: 1-gallon kit  •  5-gallon kit

Carbozinc 11 Coverage Rates

Recommended DFT: 2–3 mils per coat. Do not exceed 6 mils DFT — over-application restricts field weldability and increases risk of mud-cracking. Minimum DFT for cathodic protection is typically 2 mils.

DFT per Coat Coverage (Theoretical) Typical Use
2.0 mils (50 µm) 500 ft²/gal Minimum — atmospheric protection
3.0 mils (75 µm) 333 ft²/gal Standard recommended — most applications
1.0 mil (25 µm) 1,000 ft²/gal Theoretical reference — not a target DFT
>6 mils (150 µm) — ⚠️ Not recommended — limits field weldability

Allow for application loss. Source: Carboline Carbozinc 11 TDS.

Good to Know Before You Buy

⚠️ Pro Tips & Gotchas — IOZ Primers Are Different
  1. Sieve zinc powder through a 30-mesh screen. Zinc powder MUST be sieved as it is poured slowly into the liquid base with continuous agitation. Lumps cause streaks, nozzle clogs, and uneven coverage. Never skip this step.
  2. No roller application. Roller is not recommended for Carbozinc 11 or any inorganic zinc primer. Use spray (preferred) or brush only.
  3. Mist coat required before topcoating. Applying an epoxy intermediate directly over IOZ without a mist coat causes bubbling and pinholes from zinc outgassing. Always apply a thin diluted mist coat first, let it flash off briefly (5–10 minutes at 75°F), then apply the full wet intermediate coat.
  4. Humidity-dependent cure. IOZ cures via moisture in the air. At RH below 35%, cure is slow or incomplete. Do not apply in very dry conditions — lightly mist the substrate if RH is low. Optimal range is 35–85% RH.
  5. Maximum 6 mils DFT. Over-application limits field weldability and can cause mud-cracking. Stay within the 2–3 mil recommended range for most applications.
  6. Not for immersion without a full topcoat system. Carbozinc 11 provides galvanic (atmospheric) cathodic protection. For submerged or immersion service, always apply a complete topcoat system over the cured IOZ.
  7. Pot life is 8 hours at 75°F. Significantly longer than most epoxies due to the inorganic silicate binder. However, zinc settles quickly in the mixed pot — keep the material agitated throughout application to maintain uniform zinc distribution.
  8. Surface must be SSPC-SP6 minimum; SP10 for maximum protection. IOZ primers require a clean, blasted steel surface with adequate profile (1.5–2.5 mils) for mechanical adhesion and proper cathodic protection. Hand tool or power tool cleaning alone is not sufficient.

Frequently Asked Questions — Carbozinc 11

What is the coverage rate for Carbozinc 11?
Carbozinc 11 covers 333 ft²/gal at 3.0 mils DFT and 500 ft²/gal at 2.0 mils DFT (theoretical). The recommended DFT range is 2–3 mils per coat. Allow for application loss in your coverage estimate. Do not exceed 6 mils DFT as over-application limits field weldability.
How do I properly mix Carbozinc 11?
Pour the liquid silicate base into your mixing container first. Then slowly pour the zinc powder through a 30-mesh screen into the liquid while continuously agitating with a mechanical mixer. Never skip sieving — lumps cause streaks, nozzle clogs, and uneven coverage. The mix ratio is 1:1 by volume (liquid base to zinc powder). Keep the mixed material agitated throughout application as zinc settles quickly.
Why is a mist coat required before topcoating over Carbozinc 11?
Inorganic zinc primers are porous and off-gas as an epoxy intermediate cures over them. Applying an epoxy topcoat directly over IOZ without a thin mist coat traps the gases, causing bubbling and pinholes in the film. Apply a diluted mist coat first, allow brief flash-off (5–10 minutes at 75°F), then apply the full wet intermediate coat over it.
Can Carbozinc 11 be applied with a roller?
No — roller application is not recommended for Carbozinc 11 or any inorganic zinc primer. The high zinc content and thin viscosity required make roller application impractical and result in poor film quality. Use airless spray (preferred), conventional spray, or brush only.
What humidity is required to apply and cure Carbozinc 11?
Carbozinc 11 cures via moisture in the air (atmospheric moisture). Optimal relative humidity is 35–85% RH. Below 35% RH, cure will be slow or incomplete — lightly mist the substrate or wait for higher humidity. Above 85% RH, check for surface condensation before applying. Surface temperature must be at least 5°F above the dew point at all times during application.
Is Carbozinc 11 approved for SSPC Paint 20?
Yes — Carbozinc 11 meets SSPC Paint 20 Type I Level 1 and ASTM D520 Type II requirements for inorganic zinc-rich coatings. It also meets the Class B slip coefficient requirement for faying surfaces in bolted structural steel connections.
What is the pot life of Carbozinc 11?
Carbozinc 11 has a pot life of 8 hours at 75°F (24°C) — significantly longer than most two-component epoxies due to its inorganic silicate binder chemistry. However, zinc powder settles out of suspension quickly, so keep the mixed material continuously agitated throughout the application period to maintain uniform zinc distribution in the film.
Can Carbozinc 11 be used as a standalone coating without a topcoat?
Carbozinc 11 can provide atmospheric cathodic protection on its own in certain mild exposures, but it is typically specified as the primer in a multi-coat system. For immersion, buried, or severely corrosive environments, a full epoxy intermediate and polyurethane or epoxy topcoat system is required over the cured IOZ. Consult Carboline Technical Service for system selection.

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