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Carbothane 134 HG 2 part kit polyurethane gloss coating

Carbothane 134 HG by Carboline

by Carboline
$292.27 - $1,911.84
$292.27
$292.27 - $1,911.84
$292.27
Carbothane 134 HG is a high-performance, thin-film polyurethane coating designed for exceptional durability and aesthetics.
This product offers a high-gloss finish with superior weathering performance characteristics, making it suitable for various industrial and architectural applications.

Here are some key features:
  • Durability: Carbothane 134 HG provides a smooth, durable finish that excels in resistance against corrosion, abrasion, and chemical exposure. This makes it ideal for environments where longevity and protection are paramount.
  • Weatherability: This coating is known for its excellent weatherability. It far outperforms industry standards for color and gloss retention, adhering to or exceeding SSPC Level 3 urethane specifications.
  • Versatility: It is used extensively in virtually all industrial markets, including water and wastewater, oil and gas, petrochemical, offshore/marine, bridge and highway, architectural and commercial, power, pulp and paper, and mining.
  • Aesthetic Options: Available in many colors, including 1864 (White), S800 (White), 6666 (Safety Yellow), 1675 (Ignition Yellow), 5555 (Safety Red), C703
    (Grey), C705 (Light Grey), and C900 (Black). If a color you're interested in is not listed on this page, don't hesitate to get in touch with our support team.

Application: The product can be applied via spray for optimal coverage, with up to 25 oz/gal (20%) of thinner recommended, or by brush or roller for touch-ups and smaller areas. Mixing Part A and B according to manufacturer instructions is crucial to ensure the best results.

Theoretical Coverage: Coverage rates include
1123 ft²/gal at 1.0 mils, 
561 ft²/gal at 2.0 mils 
374 ft²/gal at 3.0 mils 
Allow for loss during mixing and application.

This coating enhances the appearance of the surface it's applied to and significantly extends the service life, making it a cost-effective solution for protective and decorative needs. For more detailed application guidance, please refer to the product's datasheet. 

CARBOTHANE 134 HG IS SOLD IN 1-GALLON & 5-GALLON KITS, INCLUDING PARTS A & B.

Product type: Aliphatic Acrylic Polyurethane
Finish: Carbothane has a gloss
Application Method: Conventional Spray, Airless Spray, Brush, or Roller
Mixing: 4:1 Ratio Parts A (Carbothane 134 HG) to B (Urethane Converter 811)
Thinner: Use Carboline Thinner 25, or 215

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

If you need a specific color not listed below, please indicate the exact color code desired in the order notes field during checkout. We can accommodate most requested colors. The color chart in the product images is for reference. 

Color: Black (C900)
Size: 1 Gallon
Coverage Calculator
⚠️ Carbothane 134 HG is a finish topcoat — it must be applied over a compatible primer or epoxy intermediate coat. It cannot be applied directly to bare steel. See the Coating Systems section below to choose the right system for your project.

Compatible Thinners

Thinner Application Max Rate
Thinner #25 › Spray (preferred) 20% (25 oz/gal)
Thinner #214 Spray 20% (25 oz/gal)
Thinner #72 Spray 20% (25 oz/gal)
Thinner #215 Brush & Roller only 20% (25 oz/gal)

Do not use Thinner #2 or #33 — those are for epoxy products. Use of unauthorized thinners voids warranty.

What Do I Need Under This?

New steel Carboguard 890 (4–6 mils) → Carbothane 134 HG
Steel over rust Carboguard 890 (6–8 mils over rust) → Carbothane 134 HG
High corrosion Carboguard 893 (primer) → Carboguard 890 → Carbothane 134 HG
Marine / offshore Carbozinc 11 (zinc primer) → Carboguard 890 → Carbothane 134 HG
Not sure? Call (800) 567-5358 — our coating specialists will recommend the right system for your environment.

Recommended Coating Systems

Two-Coat System — Standard Industrial
Intermediate / Primer Carboguard 890 4–6 mils DFT · self-priming
→
Topcoat ← You Are Here Carbothane 134 HG 2–3 mils DFT · UV-stable gloss
Zinc-Rich System — Marine / Offshore
Zinc Primer Carbozinc 11 galvanic protection
→
Intermediate Coat Carboguard 890 4–6 mils DFT · ties system together
→
Topcoat ← You Are Here Carbothane 134 HG 2–3 mils DFT

Frequently Purchased Together

Carboline Thinner No. 25 — for Carbothane 134 HG spray application
Carboline Thinner No. 25
Preferred spray thinner for 134 HG. Up to 20% addition rate.
$137.53 / gal
Shop Now
Carboguard 890 Self-Priming Epoxy — intermediate coat under Carbothane 134 HG
Carboguard 890 Epoxy
Most common intermediate coat under 134 HG. Self-priming, 4–6 mils.
$419.48 / 2-gal kit
Shop Now
Carboguard 893 Corrosion Resistant Epoxy Primer — for three-coat systems with Carbothane 134 HG
Carboguard 893 Primer
Corrosion-resistant primer for high-performance three-coat systems.
$439.48 / kit
Shop Now
Carbozinc 11 Inorganic Zinc Primer — for marine and offshore coating systems with Carbothane 134 HG
Carbozinc 11 Zinc Primer
Zinc-rich primer for marine and offshore systems. Maximum corrosion protection.
$292.27 / kit
Shop Now

Carbothane 134 HG High-Gloss Aliphatic Polyurethane Topcoat by Carboline

Product Specs — Carbothane 134 HG

Carbothane 134 HG — High-Gloss Aliphatic Acrylic Polyurethane Topcoat by Carboline.
Thin-film, high-gloss finish with exceptional UV resistance, weatherability, and color and gloss retention. The preferred finish coat over epoxy systems for industrial and exterior applications. Available in standard and metallic colors. Meets SSPC Paint 36 Level 3, AWWA D102, MIL-PRF-85285E, and USDA requirements.

✓ UV-Stable — Will Not Yellow or Chalk ✓ Indefinite Recoatability
✓ SSPC Paint 36 Level 3  •  ✓ AWWA D102 OCS 5 & 6  •  ✓ MIL-PRF-85285E Type II Class H  •  ✓ UFGS 09 97 13.27  •  ✓ USDA-inspected facility approved  •  ✓ AIM VOC compliant

✏️ Need a project quote? Request Online

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

Carbothane 134 HG by Carboline

Carbothane 134 HG high-gloss aliphatic acrylic polyurethane topcoat by Carboline — industrial finish coat
Carbothane 134 HG — High-Gloss UV-Stable Polyurethane Topcoat

Shipping Time

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

Carboline orders ship from the regional warehouse 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 are typical but not guaranteed.

Available sizes: 1-gallon kit  •  5-gallon kit (Parts A & B included)

Shipping Map — Delivery Timing

US regional warehouse map showing estimated shipping transit times for Carboline product orders from Material Warehouse
Typical transit times vary by destination zone.
Carbothane 134 HG polyurethane topcoat applied on industrial steel tank showing high-gloss finish with superior UV resistance
Carbothane 134 HG applied as a finish coat on industrial steel.

Coverage Rates & Key Specs

Recommended DFT: 2–3 mils per coat. Thin-film, high-coverage topcoat — 70% volume solids gives excellent spread rate. Do not exceed 3 mils per coat. Allow for loss in mixing and application.

DFT per Coat Coverage (Imperial) Coverage (Metric) Typical Use
2.0 mils (50 µm)561 ft²/gal13.8 m²/lStandard finish coat
3.0 mils (75 µm)374 ft²/gal9.2 m²/lMaximum recommended DFT
1.0 mil (25 µm)1,123 ft²/gal27.6 m²/lTheoretical reference

Solids by volume: 70% ±2%. Allow for loss in mixing and application.
Source: Carboline Carbothane 134 HG TDS (January 2024, doc 0859)

Technical Specifications

PropertyValueNotes
Generic TypeAliphatic Acrylic PolyurethaneNo polyester component — differs from 133 LV/LH/HB
FinishGlossHigh-gloss — only gloss finish in the 133/134 family
Volume Solids70% ±2%—
Recommended DFT2–3 mils (50–75 µm) per coatDo not exceed 3 mils per coat
Coverage @ 2 mils561 ft²/gal (13.8 m²/l)Theoretical — allow for loss
Coverage @ 3 mils374 ft²/gal (9.2 m²/l)Theoretical — maximum recommended DFT
VOC (As Supplied)2.2 lbs/gal (264 g/l)AIM compliant · Thinner 236E for lower HAPs/VOC
Mix Ratio4:1 (Part A to Part B)Part B: Urethane Converter 811 · do not mix partial kits
Pot Life4 hours at 75°F (24°C)Less at higher temps · moisture causes gellation
Min Application TempMaterial 50°F (10°C) · Surface 35°F (2°C)Additive 101 extends cure to 20°F (–7°C)
Max Humidity80% RHMost restrictive in the 133/134 family (others allow 90%)
Dry to Handle @ 75°F8 hoursBased on 2.0 mil DFT
Dry to Recoat @ 75°F8 hoursMaximum recoat time is indefinite
Dry Temp. Resistance300°F (149°C) continuousSome discoloration/gloss loss at elevated temps
Application MethodsConventional Spray, Airless Spray, Brush, RollerBrush for touch-up only
Spray ThinnersThinner 214, Thinner 25, or Thinner 72Up to 25 oz/gal (20%) · Thinner 236E for low HAPs
Brush/Roller ThinnerThinner 215Up to 25 oz/gal (20%)
CleanupThinner 2 or acetone—
Approved SpecificationsSSPC Paint 36 Level 3 · AWWA D102 OCS 5&6 · MIL-PRF-85285E Type II Class H · UFGS 09 97 13.27 · USDA—
Metallic ColorsYes — availableOnly product in the 133/134 family with metallic options
Indefinite RecoatabilityYesNo maximum recoat window; tack test with Thinner 214/215
Shelf Life — Part AMin. 36 months at 75°FUnopened, stored indoors
Shelf Life — Part BMin. 24 months at 75°FUrethane Converter 811

Mixing Instructions

Mix Ratio: 4:1 by volume (Part A to Part B)
Part A: Carbothane 134 HG  •  Part B: Urethane Converter 811

Power mix Part A separately. Add Part B and power mix together until uniform. Do not mix partial kits.

Pot life: 4 hours at 75°F (24°C) — shorter at higher temperatures. Pot life ends when the coating becomes too viscous to use.

⚠️ Moisture Sensitive: This product is moisture sensitive in the liquid stage and until fully cured. Protect from high humidity, rain, and dew until the coating is fully cured. Application above 80% RH or exposure to moisture may result in loss of gloss or micro-bubbling. If micro-bubbling occurs, allow a 30–60 minute induction time before continuing.

Thinning by Application Method

Method Max Thinning Recommended Thinner
Spray (all types)Up to 20% (25 oz/gal)Thinner 214, Thinner 25, or Thinner 72
BrushUp to 20% (25 oz/gal)Thinner 215
RollerUp to 20% (25 oz/gal)Thinner 215
Low HAPs/VOC OptionPer Carboline guidanceThinner 236E

Do not use Thinner 2 (epoxy thinner) with Carbothane 134 HG. Unauthorized thinners may void the product warranty.

Carbothane 134 HG high-gloss polyurethane topcoat being spray applied over industrial epoxy primer system
Carbothane 134 HG spray applied over epoxy. Mix ratio: 4:1 (A to B).

Application Conditions

Condition Material Temp. Surface Temp. Ambient Temp. Humidity
Minimum50°F (10°C)35°F (2°C)35°F (2°C)0%
Maximum100°F (38°C)120°F (49°C)95°F (35°C)80%
⚠️ Substrate temperature must be at least 5°F (3°C) above the dew point. Do not apply in fog, rain, or when surface condensation is present. The 80% RH maximum is more restrictive than the Carbothane 133 series (which allows 90% RH) — monitor humidity closely on humid job sites.

Curing Schedule

Surface Temp. Dry to Handle Dry to Recoat Final Cure
35°F (2°C)36 hrs36 hrs14 days
50°F (10°C)16 hrs16 hrs10 days
75°F (24°C)8 hrs8 hrs7 days
90°F (32°C)4 hrs4 hrs5 days

Based on 2.0 mil (50 micron) DFT. Higher film thickness or poor ventilation extend cure times.

Indefinite recoatability: No maximum recoat window. Before recoating aged Carbothane 134 HG, wipe a test area with Thinner 214 or 215 — a slight tack means the surface is ready without sanding. If no tack is present, lightly abrade before recoating.

Cold weather: Additive 101 (1–2 oz per mixed gallon, max 6 oz per 5-gal kit) can accelerate cure down to 20°F (–7°C). Note: Additive 101 reduces pot life by approximately 40–50%.

Compatible Substrates & Surface Preparation

Carbothane 134 HG is a finish coat requiring a compatible primer or epoxy intermediate. Do not apply directly to bare steel without an appropriate primer system.

Substrate Preparation Requirement
All Surfaces (General)Clean and dry, free of oil/grease/dust per SSPC-SP 1. Apply appropriate Carboline primer as recommended by Carboline Technical Service.
Galvanized SteelPrime with specific Carboline primer as recommended. Follow the primer's product data sheet for substrate preparation requirements.
Previously PaintedLightly abrade to roughen and degloss. Existing coating must achieve minimum 3A rating per ASTM D3359 adhesion test. Clean per SSPC-SP 1.
Over Carboguard 890 / EpoxyAllow epoxy to cure to its recoat window. Surface must be clean and dry. Apply within the epoxy's maximum recoat window for best adhesion.

Good to Know Before You Buy

⚠️ Application Notes & Pro Tips
  1. 80% RH maximum — the most restrictive in the 133/134 family. The Carbothane 133 products (LV, LH, HB) allow up to 90% RH. Carbothane 134 HG's gloss finish is more sensitive to moisture; monitor humidity closely and plan application around weather windows on humid job sites.
  2. 4:1 mix ratio — verify before mixing. Each Carbothane product uses a different ratio: 134 HG is 4:1, 133 LV is 5:1, 133 HB is 6:1. Do not mix partial kits.
  3. Do not use Thinner 2 with Carbothane 134 HG. Thinner 2 is an epoxy thinner compatible with Carboguard 890. For 134 HG: spray with Thinner 214, 25, or 72; brush/roller with Thinner 215. Use Thinner 236E for lower HAPs/VOC.
  4. This is the only gloss and metallic-color product in the 133/134 family. If a specification calls for high gloss or metallic-pigmented colors, 134 HG is the correct product. For satin finishes, see 133 HB, 133 LH, or 133 LV.
  5. It is a finish coat only — requires a primer. Do not apply to bare steel without a compatible Carboline primer system. Consult Carboline Technical Service if unsure which primer is appropriate for your substrate and service environment.
  6. Indefinite recoat window — tack test with Thinner 214 or 215. Unlike most polyurethane topcoats, there is no maximum recoat time. Before recoating, wipe a test area with Thinner 214 or 215: slight tack means recoat without abrading; no tack means lightly sand first.
  7. Additive 101 enables cold-weather cure to 20°F (–7°C). Add at 1–2 oz per mixed gallon. Note: Additive 101 reduces pot life by approximately 40–50% — reduce batch size accordingly.
  8. Micro-bubbling tip. If micro-bubbling appears during application, stop and allow a 30–60 minute induction time before continuing. This is typically caused by elevated humidity or application over surfaces that are not sufficiently dry.

Frequently Asked Questions — Carbothane 134 HG

What is the coverage rate for Carbothane 134 HG?
At the recommended 2–3 mil DFT: 561 ft²/gal at 2 mils and 374 ft²/gal at 3 mils (theoretical, based on 70% volume solids). As a thin-film topcoat, Carbothane 134 HG goes significantly further per gallon than the epoxy coats typically applied beneath it. Allow for loss in mixing and application.
Is Carbothane 134 HG UV resistant?
Yes — Carbothane 134 HG is an aliphatic polyurethane, which means it is inherently UV-stable and will not yellow, chalk, or lose gloss in direct sunlight. Unlike aromatic epoxies such as Carboguard 890, which chalk and dull outdoors, Carbothane retains its high-gloss finish and color on exterior surfaces. It exceeds SSPC Paint 36 Level 3 specifications for color and gloss retention.
What is the mix ratio and pot life?
Mix ratio is 4:1 by volume (Part A to Part B, Urethane Converter 811). Power mix Part A separately, then combine with Part B and power mix again. Do not mix partial kits. Pot life is 4 hours at 75°F (24°C) — shorter at higher temperatures. This product is moisture sensitive — avoid applying in high humidity or when moisture is present on the substrate.
What specifications does Carbothane 134 HG meet?
Carbothane 134 HG meets or exceeds SSPC Paint 36 Level 3, AWWA D102 OCS 5 and 6, MIL-PRF-85285E Type II Class H, UFGS 09 97 13.27, and is approved for USDA-inspected facilities. It is also VOC compliant to current AIM regulations. These approvals make it a common specification choice for water infrastructure, government, and military projects.
Can Carbothane 134 HG be recoated after years of exposure?
Yes — Carbothane 134 HG has indefinite recoatability. Before recoating aged Carbothane, wipe a test area with Thinner 214 or 215: a slight tack means the surface is ready to recoat without sanding. If no tack is present, lightly abrade before applying the new coat. Clean the surface thoroughly before recoating regardless.
What thinner should be used with Carbothane 134 HG?
For spray: Carboline Thinner 214, Thinner 25, or Thinner 72 at up to 25 oz/gal (20%). For brush and roller: Thinner 215 at up to 25 oz/gal. Use Thinner 236E to minimize HAPs and VOC emissions. Do not use Thinner 2 (which is an epoxy thinner intended for products like Carboguard 890 and is not compatible with Carbothane polyurethane chemistry). Unauthorized thinners may void the product warranty.
How does Carbothane 134 HG differ from the 133 series?
Carbothane 134 HG is the only gloss finish in the 133/134 family and the only product with metallic colors. It uses a 4:1 mix ratio and 2–3 mil DFT (thinner film than the 133 satin products at 3–5 mils). It has the most restrictive humidity limit (80% RH) compared to 90% RH for 133 LV, 133 LH, and 133 HB. It meets AWWA, MIL-PRF, UFGS, and USDA specifications not available on the 133 satin products. The 133 products use an acrylic-polyester binder; 134 HG uses an acrylic-only binder without the polyester component.

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