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Carboline Carboweld 11 - Weldable re-construction inorganic Zinc Primer

Carboweld 11 - Weldable Inorganic Zinc Primer

by Carboline
$789.28 - $789.28
$789.28
$789.28 - $789.28
$789.28
Carboweld 11 is a self-curing, inorganic zinc silicate primer engineered as a weldable pre-construction shop primer for steel fabrication.
This product provides reliable corrosion protection during the construction phase of a project while allowing fabricators to weld and cut coated steel at production-line speeds, making it ideal for shipyards, structural steel shops, and other industrial fabrication environments.

Here are some key features:
  • Weldability: Welds made over Carboweld 11 coated steel are equal in every respect to welds made to uncoated steel. The coating supports submerged arc, flux core, short arc, and MIG processes at automatic welding speeds up to 48″ per minute, with weld spatter that does not adhere to or damage the surrounding film.
  • Fast Cure: Carboweld 11 dries to touch and to handle in 3 to 5 minutes at typical shop temperatures, allowing coated plate to be moved, stacked, and processed almost immediately after spraying with minimal disruption to fabrication workflow.
  • Certified Pre-Construction Primer: Carboweld 11 is certified as a pre-construction primer for Lloyd’s Register constructions, making it well suited for shipbuilding, offshore/marine, structural steel, and other heavy-fabrication industries that require third-party-approved shop primers.

Application: The product is applied by conventional or airless spray for optimal coverage. Thinning is not normally required, but up to 25.6 oz/gal of Thinner #21 may be used in cool weather (below 40°F) or Thinner #33 in hot or windy conditions. Brush application is permitted for touch-up of areas less than one square foot.
DO NOT APPLY BY ROLLER. Power-mix the base, then sift the zinc filler slowly into the base under continuous agitation, mix until lump-free, and pour through a 30-mesh screen. Do not mix partial kits. Keep under mild agitation during application. Pot life is 48 hours at 75°F.

Carboweld 11 protects steel during the construction phase without slowing the fabricator, helping shops maintain high welding throughput while still delivering a corrosion-resistant, topcoat-ready surface. For projects with extended construction phases or specialized service conditions, please consult Carboline Technical Service. For full application guidance, refer to the product’s datasheet.

CARBOWELD 11 IS SOLD IN 3-GALLON & 15-GALLON KITS, INCLUDING PARTS A & B.

Product type: Self-Curing Inorganic Zinc Silicate
Finish: Flat
Application Method: Conventional Spray, Airless Spray, or Brush (touch-up only – DO NOT ROLL)
Mixing: Part A (Base) + Part B (Zinc Filler Type II) – sift filler into base under agitation; do not mix partial kits
Thinner: Use Carboline Thinner #21 (cool weather, below 40°F) or Carboline Thinner #33 (hot/windy conditions)
Pot Life: 48 hours at 75°F (24°C)
Shelf Life: Part A – 18 months; Part B – 24 months at 75°F (24°C)

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

Carboweld 11 is supplied in Gray (J700) standard only. For specialized topcoat recommendations or alternate shop-primer options for extended construction phases, please indicate your requirements in the order notes field during checkout or contact our support team.

Size: 3-gal
Coverage Calculator

Compatible Thinners

Thinner Use With Max Rate
Thinner #21 Cool weather (below 40°F / 4°C) · Cleanup 25.6 oz/gal
Thinner #33 Hot or windy conditions 25.6 oz/gal

Thinning is not normally required. Use only Carboline-approved thinners — unauthorized thinners may void the manufacturer's warranty.

Recommended Coating Systems

Shop Primer Only — Short Construction Phase
Pre-Construction Primer Carboweld 11 0.6–0.8 mils DFT · weldable shop primer
Two-Coat Atmospheric System
Shop Primer Carboweld 11 0.6–0.8 mils DFT · weld through
→
Topcoat Carboguard 890 4–6 mils DFT · epoxy mastic
Three-Coat Marine / Industrial System
Shop Primer Carboweld 11 0.6–0.8 mils DFT
→
Intermediate Coat Carboguard 890 4–6 mils DFT
→
UV Topcoat Carbothane 134 HG 2–3 mils DFT · polyurethane

Frequently Purchased Together

Carboline Thinner No. 21
Carboline Thinner No. 21
Primary thinner for Carboweld 11 in cool weather. Also used for spray line cleanup.
Call for pricing
Shop Now
Carboline Thinner No. 33
Carboline Thinner No. 33
Hot-weather thinner for Carboweld 11. Use in hot or windy shop conditions.
$137.22 / gal
Shop Now
Carboguard 890 Epoxy Mastic
Carboguard 890
Cycloaliphatic amine epoxy mastic. Ideal topcoat or intermediate over Carboweld 11.
From $419.48 / 2 gal kit
Shop Now
Carbothane 134 HG Polyurethane Topcoat
Carbothane 134 HG
High-gloss UV-stable polyurethane finish coat for exterior service over the Carboweld 11 system.
From $292.27
Shop Now

Carboweld 11 Weldable Inorganic Zinc Pre-Construction Shop Primer by Carboline

Product Specs — Carboweld 11

Carboweld 11 — Self-Curing Inorganic Zinc Silicate Pre-Construction Primer by Carboline.
A weldable shop primer engineered to protect steel during the construction phase. Welds through the coating at production-line speeds up to 48 inches per minute with no loss in weld strength or consistency. Weld spatter does not adhere to or damage the coating. Dries to handle in just 3–5 minutes. Lloyds Register certified. For shop use only.

✓ Lloyds Register Certified  •  ✓ 85% ±1% Zinc in Dry Film  •  ✓ Welds at up to 48"/min  •  ✓ Dries to Handle in 3–5 min  •  ✓ Shop Use Only

✏️ Need a project quote? Request Online

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

Carboweld 11 by Carboline

Carboweld 11 self-curing inorganic zinc silicate weldable pre-construction shop primer by Carboline — 3-gallon kit
Carboweld 11 — Weldable Inorganic Zinc Shop Primer (3-Gallon Kit)

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 size: 3-gallon kit (38 lbs)

Mixing Instructions

Two-part kit: Part A (Base) + Part B (Zinc Filler Type II)

Power mix the base, then sift the zinc filler slowly into the base with continuous agitation. Mix until free of lumps and pour through a 30-mesh screen. Do not mix partial kits. Keep under mild agitation throughout application. If spraying stops for more than 15 minutes, recirculate the material remaining in the spray line.

Pot life: 48 hours at 75°F (24°C). Shorter at higher temperatures. Pot life ends when the coating becomes too viscous to use.

Kit Sizes & Component Breakdown

Kit Size Part A (Base) Part B (Zinc Filler Type II)
3-Gallon KitOne 5-gal can (partially filled)14.6 lbs (6.6 kg)

Thinning by Conditions

Thinning is not normally required. When job conditions require it, use only Carboline-approved thinners. Unauthorized thinners may void the warranty.

Condition Recommended Thinner Max Rate
Cool Weather (below 40°F / 4°C)Carboline Thinner 21Up to 25.6 oz/gal
Hot or Windy ConditionsCarboline Thinner 33Up to 25.6 oz/gal
Cleanup / Spray Line FlushThinner 21 or IsopropanolAs needed

Coverage Rates

Recommended DFT: 0.6–0.8 mils (15–20 microns) per single coat. Thicknesses up to 1.5 mils (37 microns) are acceptable. Excess film thickness can cause solvent entrapment and premature failure.

DFT Theoretical Coverage
0.6 mils (15 µm)~767 ft²/gal (~18.8 m²/l)
0.7 mils (17 µm) — reference657 ft²/gal (16.1 m²/l)
0.8 mils (20 µm)~575 ft²/gal (~14.1 m²/l)
1.5 mils (37 µm) — max~307 ft²/gal (~7.5 m²/l)

Solids by weight: 48%. Zinc in dry film: 85% ±1%. Allow for application loss. Source: Carboline Carboweld 11 PDS (October 2024, doc 0241).

Curing Schedule

Times based on 0.75–1.5 mil (20–40 micron) DFT. Curing can be accelerated in dry conditions by raising humidity via steam or water spray after an initial 1-hour dry at 75°F.

Surface Temp. Dry to Handle Final Cure
0°F (–18°C)2 Hours5 Days
40°F (4°C)40 Minutes12 Hours
60°F (16°C)15 Minutes6 Hours
80°F (27°C)5 Minutes4 Hours
100°F (38°C)3 Minutes2 Hours

Surface Preparation

Carboweld 11 is designed for new structural steel in shop application only. All surfaces must be clean and dry before application.

Surface / Service Preparation Requirement
General DegreasingRemove all oil and grease per SSPC-SP1 using Thinner 2 or Surface Cleaner 3
Steel — Non-ImmersionSSPC-SP6 (Commercial Blast) · Profile: 1.0–1.5 mils angular
Steel — Immersion-BoundSSPC-SP10 (Near-White Blast) · Profile: 1.0–1.5 mils angular
Under High-Build TopcoatsIncrease blast profile to 1.5–2.5 mils for proper topcoat anchor

Substrate temperature must be above the dew point. Condensation below the dew point causes flash rusting on prepared steel and interferes with adhesion. Source: Carboline Carboweld 11 PDS (October 2024, doc 0241).

Welding Performance

Carboweld 11 is engineered to be welded through. Welds made over Carboweld 11 coated steel are equal in every respect to welds made to uncoated steel — with no loss in strength or consistency and no adhesion of weld spatter to the coating.

Automatic welding: up to 48 inches per minute when applied at recommended DFT, depending on plate thickness and bead size.

Compatible welding processes:

  • Submerged Arc
  • Flux Core
  • Short Arc
  • Metal Inert Gas (MIG)

Application method: Airless or conventional spray preferred. Brush for touch-up of areas under 1 sq ft only — avoid overbrushing. Do not apply by roller.

Key Specifications, Packaging & Storage

Property Value
Generic TypeSelf-Curing Inorganic Zinc Silicate
Intended UsePre-construction shop primer — shop use only
Color / FinishGray (J700) · Flat
Solids by Weight48%
Zinc in Dry Film85% ±1%
VOC (As Supplied)5.32 lbs/gal (638 g/l) nominal
Recommended DFT0.6–0.8 mils (15–20 microns) per coat · max 1.5 mils
Theoretical Coverage657 ft²/gal at 0.7 mils (16.1 m²/l at 17 microns)
Pot Life48 hours at 75°F (24°C)
Dry to Handle @ 80°F5 minutes
Application Temp — MaterialMin 0°F (–18°C) · Max 130°F (54°C)
Application Temp — SurfaceMin 0°F (–18°C) · Max 200°F (93°C)
Application Temp — AmbientMin 0°F (–18°C) · Max 130°F (54°C)
Humidity Range30% – 95% RH
Welding CompatibilitySubmerged Arc, Flux Core, Short Arc, MIG · up to 48"/min
CertificationLloyds Register pre-construction primer
Application MethodsAirless Spray, Conventional Spray, Brush (touch-up only) · No Roller
CleanupThinner 21 or Isopropanol
Flash Point (Base)52°F (11°C)
Shelf Life — Part A18 months at 75°F (24°C)
Shelf Life — Part B24 months at 75°F (24°C)
StorageIndoors · 40–110°F (4–43°C) · 0–90% RH
Kit Size3-Gal Kit (38 lbs / 17.3 kg)

Source: Carboline Carboweld 11 PDS (October 2024, doc 0241).

Good to Know Before You Buy

⚠️ Key Points for Buyers
  1. It's a weld-through primer, not a finish coat. Carboweld 11's purpose is to protect steel through fabrication and welding — welds made over it are equal to welds on bare steel, and it runs through automatic processes at up to 48"/min. That production-line weldability is the reason to choose it over a standard shop primer.
  2. Shop use only — built for the construction phase, not long-term exposure. It protects steel during normal construction timelines. For projects with extended outdoor exposure before topcoating, ask Carboline Technical Service about a longer-duration primer instead.
  3. Plan your topcoat around the service environment. Carboweld 11 can be topcoated for long-term atmospheric protection, but the right topcoat depends entirely on the end use (atmospheric, immersion, chemical, high-heat). Confirm the topcoat with Carboline before specifying.
  4. Order a full kit — partial kits won't perform. The two-part kit must be mixed complete to hit the correct zinc-to-binder ratio. A single 3-gallon kit covers up to ~650 ft² at recommended DFT, so plan your quantity accordingly.

Frequently Asked Questions — Carboweld 11

What is the coverage rate for Carboweld 11?
Carboweld 11 has a theoretical coverage of 657 ft²/gal at 0.7 mils DFT (16.1 m²/l at 17 microns). Recommended single-coat dry film thickness is 0.6–0.8 mils (15–20 microns). Thicknesses up to 1.5 mils (37 microns) are also acceptable. Practical yield is lower after mixing and application loss.
Can steel be welded through Carboweld 11?
Yes — Carboweld 11 is specifically engineered for welding. Welds made over coated steel are equal in every respect to welds made to uncoated steel with no loss in strength or consistency. Automatic welding speeds up to 48 inches per minute are achievable via submerged arc, flux core, short arc, and MIG processes. Weld spatter does not adhere to or damage the coating.
What is the mix ratio and pot life of Carboweld 11?
Carboweld 11 ships as a two-part kit. The 3-gallon kit contains one partially filled 5-gallon can of Part A (Base) plus a 14.6 lb (6.6 kg) unit of Part B (Zinc Filler Type II). Power mix the base, then sift the zinc filler slowly into the base under continuous agitation, and pour through a 30-mesh screen. Do not mix partial kits. Pot life is 48 hours at 75°F — shorter at higher temperatures.
How fast does Carboweld 11 dry?
Carboweld 11 dries to handle in 3–5 minutes under typical shop conditions. At 80°F: dry-to-handle in 5 minutes, final cure in 4 hours. At 40°F: dry-to-handle in 40 minutes, final cure in 12 hours. At 0°F: dry-to-handle in 2 hours, final cure in 5 days. In low-humidity shops, curing can be accelerated by misting the coated surface with steam or water after an initial 1-hour dry at 75°F.
Is Carboweld 11 Lloyds Register certified?
Yes. Carboweld 11 is certified as a pre-construction primer for Lloyds Register constructions. It is widely used in shipyards and structural steel fabrication shops for protecting plate and structural sections during the construction phase prior to welding and final topcoating.
What surface preparation is required before applying Carboweld 11?
Remove all oil and grease per SSPC-SP1 using Thinner 2 or Surface Cleaner 3. For non-immersion steel, blast to SSPC-SP6 (commercial blast) with a 1.0–1.5 mil angular surface profile. For immersion-bound substrates, blast to SSPC-SP10 (near-white). Where high-build topcoats will be applied, increase the blast profile to 1.5–2.5 mils. Substrate temperature must be above the dew point at time of application.
What topcoat should be used over Carboweld 11?
Carboweld 11 can be topcoated for additional long-term atmospheric protection. The appropriate topcoat depends entirely on the intended service environment — atmospheric, immersion, chemical, or high-temperature. Consult Carboline Technical Service for the specific topcoat recommendation for your project before specifying.

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