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Carboguard 635 VOC epoxy primer potable water

Carboguard 635 VOC Immersion Grade Epoxy kit

by Carboline
$285.17 - $1,334.20
$285.17
$285.17 - $1,334.20
$285.17

Carboguard 635 VOC by Carboline is an all-purpose, immersion-grade epoxy coating designed for superior performance in challenging environments. Engineered with low volatile organic compound (VOC) and low hazardous air pollutants (HAPs) content, this versatile epoxy meets stringent environmental regulations while delivering robust protection. It can be applied directly to the metal as a corrosion-resistant self-primer, an intermediate coating over other primers, or even a finish coat, making it a multi-functional solution for many projects.

This product offers several key benefits, making it a top choice for professionals who want a premium corrosion-resistant primer with minimal off-gassing. 

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Key Benefits:
Low-Temperature Cure: This product effectively cures even in cooler conditions 20°F, expanding application possibilities. It is designed to cure effectively at lower temperatures, making it ideal for projects in colder climates or seasons where other primers might struggle to set properly. If a job requires application in chilly or unpredictable weather, 635 VOC provides a reliable edge.

Low VOC & HAPs: This coating bonds well to various substrates, including steel, concrete, and previously painted surfaces. It also adheres well to existing coatings and tightly to rust, making it suitable for maintenance and new construction projects.

Moisture Tolerance During Application: Unlike many coatings, Carboguard 635 VOC can be applied and cured in damp or humid conditions without compromising performance. This makes it a go-to choice for environments where moisture control is challenging, such as coastal areas or rainy seasons.

Immersion-Grade Performance in Potable Water: Carboguard 635 VOC is approved for potable water service (e.g., ANSI/NSF Std. 61) and meets IMO standards for seawater ballast tanks. It is suitable if the project involves direct contact with drinking water or marine immersion.

Faster Recoat and Handling Times: Carboguard 635 VOC offers quick recoat windows and rapid curing for handling, which can accelerate project timelines. This is particularly valuable for maintenance jobs or tight schedules where downtime must be minimized.

Common Industry Applications:

  • Water and Wastewater Treatment: Coating interior surfaces of potable water storage tanks, pipes, and reservoirs (approved for ANSI/NSF Std. 61). Protecting steel and concrete in wastewater treatment plants against corrosion from moisture and mild chemicals.
  • Agriculture: Coating silos, water tanks, and irrigation systems to prevent rust from constant moisture exposure. Protecting metal barns or equipment sheds in rural settings with variable weather conditions.
  • Municipal Infrastructure Lining and protecting potable water distribution systems, including pipelines and valves. Coating bridges, guardrails, and other steel structures exposed to weather and de-icing salts.
  • Oil and Gas: Coating pipelines, fittings, and above-ground storage tanks exposed to atmospheric corrosion. Protecting steel in refineries and processing plants where surface preparation may be limited.
  • Power Generation & Construction: Ensures durability and longevity for bridges, tunnels, and other critical infrastructure.

Carboguard 635 Sold IN 1 & 5 Gallon Kits, Including Parts A & B.

Product type: Cross-linked epoxy polymeric amine
Carboguard 635 VOC has a satin finish
Applied via Conventional Spray, Airless Spray, Brush, or Roller
Mixing: 4:1 Ratio Parts A to B
Thinner: Carboline #2
Not for use over latex coatings

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 Gal Kit
Coverage Calculator
Application Guidance

Compatible Thinner

Thinner Use With Max Rate
Thinner No. 2 All application methods Per TDS — do not over-thin for NSF 61 compliance
✅ NSF 61 Alert: Over-thinning voids potable water certification. Always follow TDS thinning limits for certified applications.

Frequently Purchased Together

Carboline Thinner No. 2
Required Thinner
Carboline Thinner No. 2
Required thinner for Carboguard 635 VOC. Use within TDS limits for NSF compliance.
From$129.87
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Carbothane 134 HG Polyurethane Topcoat
Finish Topcoat
Carbothane 134 HG
UV-stable polyurethane topcoat for exterior atmospheric use over CG635 VOC.
From$292.27
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Carboguard 635 VOC Cross-Linked Epoxy Polymeric Amine Coating by Carboline

Product Specs — Carboguard 635 VOC

⚠️ Product Name Notice: This product is Carboguard 635 VOC — not “Carboguard 365 VOC.” Some listings contain a copy error. You are purchasing the correct product: Carboguard 635 VOC.

Carboguard 635 VOC — Cross-Linked Epoxy Polymeric Amine by Carboline.
An all-purpose immersion-grade epoxy with low-temperature cure down to 20°F, moisture tolerance during application, and the ability to continue curing underwater. 65% solids by volume. Self-priming; usable as primer, intermediate, or finish coat. Certified by UL to meet NSF/ANSI/CAN 600 drinking water criteria. Meets IMO MSC.215(82):2006 for seawater ballast tanks. Extended 180-day atmospheric recoat window.

✓ NSF/ANSI/CAN 600 — UL Certified Potable Water  •  ✓ IMO MSC.215(82):2006 Ballast Tank  •  ✓ Self-Priming  •  ✓ Low-Temp Cure to 20°F  •  ✓ 180-Day Recoat Window

✏️ Need a project quote? Request Online

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

Carboguard 635 VOC by Carboline

Carboguard 635 VOC cross-linked epoxy polymeric amine coating kit by Carboline — NSF/ANSI/CAN 600 certified, IMO ballast tank compliant
Carboguard 635 VOC — 1-Gal & 5-Gal Kits (Parts A & B)

Shipping Map — Carboline Delivery Timing

Carboline US regional warehouse shipping map showing typical 2, 3, and 4-day delivery transit zones 🔍 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.

Carboguard 635 VOC ships from Carboline regional warehouses nearest your location. Full product stock is 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 (14 lbs / 6.4 kg)  •  5-gallon kit (65 lbs / 29.5 kg)

Technical Specifications

Recommended DFT: 4–6 mils per coat. DFT in excess of 8.0 mils per coat is not recommended. Coverage rates are theoretical (65% solids by volume); allow for loss in mixing and application.

PropertyValue
Generic TypeCross-Linked Epoxy Polymeric Amine
Gloss / FinishSatin
Standard ColorsWhite (0800) · Grey (C703) · Grey (0700) · Black (0900) · Wide range via RTS. Potable water: approved colors only — see Certifications section.
Solids by Volume65% ± 2%
Mix Ratio4:1 (Part A : Part B) by volume — NOT 1:1. Wrong ratio causes cure failure.
Pot Life3 hours at 75°F (24°C) — less at higher temperatures
Recommended DFT4–6 mils (102–152 microns) per coat — do not exceed 8.0 mils per coat
Coverage @ 4 mils261 ft²/gal (6.4 m²/l) — per PDS
Coverage @ 6 mils174 ft²/gal (4.3 m²/l) — per PDS. Reference: 1,043 ft²/gal @ 1 mil.
VOC (EPA Method 24)2.05 lbs/gal (246 g/l). With Thinner 236E or 242E @ 12 oz/gal: 2.05 lbs/gal (246 g/l). With Thinner 76 @ 12 oz/gal: 2.50 lbs/gal (300 g/l). Contains VOC-exempt t-butyl acetate.
Dry Temp. Resistance180°F (82°C) continuous · 220°F (104°C) non-continuous
Primer / TopcoatsSelf-priming; usable as primer, intermediate, or finish coat. Broad topcoat compatibility — 6-month atmospheric recoat window for most topcoats.
LimitationsEpoxies may lose gloss, discolor, and chalk in sunlight. Do not apply over latex. Immersion projects: factory-made material in approved colors only.
Special FeaturesContinues to cure underwater · Tolerates moisture during application · Low temperature cure to 20°F
Thinning — SprayThinner 242E, 236E, or 76, up to 10% by volume. Potable water: Thinner 76 ONLY.
Thinning — Brush/RollerThinner 33, up to 10% by volume
CleanupThinner 2 or MEK
CertificationsNSF/ANSI/CAN 600 (UL certified) · IMO MSC.215(82):2006
Flash PointPart A: 66°F (19°C) — flammable at ambient temp · Part B: 80°F (27°C) · Mixed: 77°F (25°C)
Shelf Life24 months at 76°F (24°C) — both Part A and Part B
Storage40°–100°F · 0–95% RH · Store Indoors · KEEP DRY
Kit Sizes / Weight1-gallon kit (14 lbs / 6.4 kg) · 5-gallon kit (65 lbs / 29.5 kg)

Coverage rates are theoretical. Allow for loss in mixing and application. Source: Carboline Carboguard 635 VOC PDS (September 2024, doc 1152).

Application Conditions

Condition Material Surface Ambient Humidity
Minimum45°F (7°C)20°F (−7°C)20°F (−7°C)0%
Maximum90°F (32°C)120°F (49°C)100°F (38°C)95%

Carboguard 635 VOC is unique in that it can tolerate damp substrates. For applications over damp surfaces, brush and roller is the preferred method.

Do not apply to substrates with ice or ice crystal formation. Dehumidify or raise the substrate temperature to eliminate ice before application. The product tolerates drops in temperature to 0°F (−17°C) during cure and will continue to cure when the temperature rises.

Excessive humidity or condensation during curing will not affect performance but may cause discoloration and surface haze. Any haze or blush must be removed by water washing before recoating.

Curing Schedule — Non-Immersion

Based on 4–6 mil (100–150 micron) DFT per coat. Maximum recoat time 180 days applies to most topcoats in atmospheric service. If exceeded, abrade by sweep blasting or sanding before recoating.

Surface Temp. Dry to Touch Dry to Handle Dry to Topcoat Min. Dry to Topcoat Max.
20°F (−7°C)4 Hours36 Hours24 Hours180 Days
35°F (2°C)2 Hours18 Hours2 Hours180 Days
50°F (10°C)1 Hour11 Hours1 Hour180 Days
75°F (24°C)30 Minutes3 Hours45 Minutes180 Days
90°F (32°C)15 Minutes1.5 Hours30 Minutes180 Days

Curing Schedule — Immersion / Antifoulant

For immersion service when an antifoulant topcoat is used. Optimum time to topcoat with antifoulant is when film is “touch-tacky.” If the touch-tacky time is exceeded or film is “glossy,” re-prime with a fresh coat of itself. Marine use undocking time: 24 hours at 75°F.

Surface Temp. Dry to Topcoat Min. Dry to Topcoat w/ Antifoulant Max. Dry to Topcoat Max.
20°F (−7°C)24 Hours36 Hours30 Days
35°F (2°C)2 Hours16 Hours30 Days
50°F (10°C)1 Hour8 Hours30 Days
75°F (24°C)45 Minutes4 Hours30 Days
90°F (32°C)30 Minutes3 Hours30 Days

Surface Preparation by Substrate

Remove oil or grease with clean rags soaked in Carboline Thinner #2 or toluol before any mechanical preparation.

Substrate / Service Preparation Requirement
Steel — Atmospheric (Optimal)SSPC-SP2, SP3, or SP11 — rust-scale free surface
Steel — Atmospheric (Maximum)SSPC-SP6 or greater · 1.5–3 mil (40–75 micron) blast profile
Steel — ImmersionSSPC-SP10 (Near-White Metal) minimum
Concrete or CMURemove loose/unsound concrete, oils, non-compatible sealers. Cured min. 28 days at 70°F (21°C) and 50% RH. Consult Carboline Technical Service for specifics.
Non-Ferrous MetalsDense angular profile 1.5–3 mils. SSPC-SP16 for atmospheric · SSPC-SP17 for immersion.
Previously PaintedMust be tightly adherent and in good condition. Must NOT be latex. Consult Carboline Technical Service.

Source: Carboline Carboguard 635 VOC PDS (September 2024, doc 1152).

Potable Water Certification — NSF/ANSI/CAN 600

Carboguard 635 VOC is certified by UL to meet the drinking water criteria of NSF/ANSI/CAN 600. The following limitations apply to maintain certified potable water compliance at 75°F (24°C):

ParameterCertified Requirement
StandardMeets drinking water criteria of NSF/ANSI/CAN 600
Certifying BodyUL (Classified)
Maximum DFT16 mils (406.4 microns)
Number of Coats1 to 2
Tank RatingOver 40,000 gallons (151,416 liters)
Pipe RatingNot Rated
Valve Rating4” or larger (10.16 cm)
ThinningThinner 76 at 10% by volume ONLY — all other thinners void certification
Cure Before Service7-day cure required at 75°F before water contact
Approved Colors0700 (Grey), 0800 (White)
Special Order Colors0100 (Blue), 0200 (Tan), 0500 (Red)

Source: Carboline Carboguard 635 VOC PDS (September 2024, doc 1152), Testing/Certification/Listing section. Always verify current certification status with Carboline Technical Service.

Good to Know Before You Buy

⚠️ Critical Notes
  1. Mix ratio is 4:1 — NOT 1:1. This is the most common error. Carboguard 635 VOC uses 4 parts A to 1 part B by volume. Confuse this with a 1:1 product like Carboguard 890 and the coating will not cure correctly. Measure precisely every time. Do not mix partial kits.
  2. Part A flash point is 66°F (19°C) — flammable at room temperature. Part A flashes at 66°F and the mixed product at 77°F. This product contains flammable solvents. Keep away from sparks and open flames during storage, mixing, and application. Use non-ferrous tools and conductive footwear in explosion-hazard areas. Use adequate ventilation in enclosed spaces — if used as a tank lining, supplied-air respirator is required.
  3. Do NOT apply over latex coatings. Adhesion failure will result. Previously painted surfaces must be completely free of latex. Test all existing coatings with ASTM D3359 before applying. For immersion projects, factory-made material in approved special colors only — field-tinted colors are not permitted for immersion service.
  4. NSF/ANSI/CAN 600 compliance has strict requirements — any deviation voids certification. Only Thinner 76 at 10% by volume may be used for potable water thinning. Only approved colors (0700 Grey, 0800 White, and special orders 0100/0200/0500). Maximum DFT 16 mils, 1–2 coats, tanks >40,000 gallons only. 7-day full cure required before water contact. Any deviation voids the certification.

Frequently Asked Questions — Carboguard 635 VOC

What is the mix ratio for Carboguard 635 VOC?
4:1 by volume (Part A to Part B). This is NOT a 1:1 product. Measure 4 parts A for every 1 part B precisely. Mix each component separately, then combine and mix until homogenous. Do not mix partial kits. Using the wrong ratio causes incomplete cure and coating failure.
Is Carboguard 635 VOC certified for potable water contact?
Yes — Carboguard 635 VOC is certified by UL to meet the drinking water criteria of NSF/ANSI/CAN 600. To maintain certification: use only Thinner 76 at 10% for thinning; use only approved colors (0700 Grey, 0800 White, or special-order 0100/0200/0500); apply 1–2 coats at max 16 mils DFT; tanks must be over 40,000 gallons; valves must be 4” or larger; allow 7-day cure before service. Any deviation voids the certification.
What are the coverage rates for Carboguard 635 VOC?
Carboguard 635 VOC has 65% solids by volume. Theoretical coverage per PDS: 1,043 ft²/gal at 1 mil, 261 ft²/gal at 4 mils (6.4 m²/l), and 174 ft²/gal at 6 mils (4.3 m²/l). Allow for application losses. Recommended DFT is 4–6 mils per coat; do not exceed 8.0 mils per coat.
Can Carboguard 635 VOC be used in seawater ballast tanks?
Yes — Carboguard 635 VOC meets IMO Performance Standard for Protective Coatings MSC.215(82):2006 for seawater ballast tanks. This is a key differentiator from products like Carboguard 890, which do not carry IMO ballast tank certification. Consult Carboline Technical Service and your classification society’s requirements for specific application parameters.
What is the minimum application and cure temperature?
Surface and ambient temperatures can be as low as 20°F (−7°C) for application. Material minimum is 45°F (7°C). The product tolerates drops in temperature to 0°F (−17°C) during cure and will continue to cure when the temperature rises. Do not apply to substrates with ice or ice crystal formation — dehumidify or raise the substrate temperature to eliminate ice first.
Can Carboguard 635 VOC be applied over existing coatings?
Yes, over previously painted surfaces that are tightly adherent and in good condition. It must NOT be applied over latex coatings — adhesion failure will result. For immersion projects, use only factory-made material in approved special colors. Consult Carboline Technical Service for specific guidance.
What thinner should I use with Carboguard 635 VOC?
For atmospheric spray applications: Thinner 242E, 236E, or 76 up to 10% by volume. These are exempt thinners (236E and 242E) that do not change the as-supplied VOC value.
For brush and roller: Thinner 33 up to 10%.
For potable water applications: Thinner 76 ONLY at 10% by volume — other thinners void NSF certification.
Alternate compatible thinners for atmospheric service: Carboline Thinner 2, 10, 15, 76, 225E, 229, 236E, 243E, 248, and Plasite Thinner #19 or #20.
Is this the same as “Carboguard 365 VOC”?
No — “Carboguard 365 VOC” is a copy error. The correct product name is Carboguard 635 VOC. Some product pages contain a typo transposing the 6 and 3. There is no Carboline product called “Carboguard 365 VOC.” You are purchasing the correct product: Carboguard 635 VOC.

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