Scar-GuardTM is a patented abrasion-resistant overcoat (ARO) designed specifically for use on horizontal directionally drilled (HDD) pipelines that need additional coating protection while being bored into the ground. Unlike liquid epoxy coatings, which were originally designed as corrosion barriers, scarguard is a fiber-reinforced moisture cure urethane resin utilized specifically for mechanical protection of girth weld coatings instead of building the thickness of your primary stand-alone corrosion coating. Softer systems like heat shrink sleeves, cold applied tapes, and visco-elastics typically cannot be used for HDD applications but by using Scar Guard as a protective ARO, a pipeline operator can utilize any of their specified coating systems on weld seams.  Scarguard has also been proven to work in conjunction with your CP system so that it can be utilized in accordance with the DOT and PHMSA codes.

The simple application of this wrap allows for speedy coating protection and backfill while also giving the most effective results of any ARO in the market today. Having scarguard allows pipeline operators to apply girth weld coatings at their ideal thickness to achieve the best performance with their corrosion barrier, rather than increasing those thicknesses and losing properties such as flexibility or impact resistance. While liquid epoxies or FBEs are the most popular types of weld coating systems in North America they are not ideal for uneven surfaces that will be installed buy manners as harsh as horizontal directional drilling. Even concrete reinforced polymers such as powercrete do not stand up well against the impact and abrasion that a borehole can present when pulling heavy pipe through a hole. By using a composite material which incorporates fibers you can improve flexibility, gouge, and abrasion resistance all while maintaining the effectiveness of the resin.  This system should be utilized as a protective layer for all field joints that are installed by a trenchless method and will or could potentially impact a high consequence area (HCA) such as a road, building, populated area, or a body of water.

Need a quote today? Fill out the Scar Guard Assessment form today: HDD Assessment Form


DatasheetSDS Sheet
InformationTesting DataCase StudiesVideos

Pipeline HDD Protection with Scar Guard
Typical Applications

  • Horizontal directional drilling and boring
  • Coating protection
  • Sacrificial Coating


  • Controlled set time
  • ScarGuard is simple, easy to install
  • Non-hazardous
  • Consistency of application, joint after joint
  • Smooth profile reduces damage during pull thru
  • No UV light or heating required


As determined by NRI


As determined by NRI

Pot Life

See system properties below


Application temperature varies per system

Surface Preparation

Surface preparation and profiling shall promote continuous intimate contact between the FRP system and pipe by providing a clean, smooth, and circumferential surface. Surface preparation shall be in accordance with SSPC-SP1 “Solvent Cleaning” and SSPC-SP11 “Power Tool Cleaning” with a 1-3 mil surface roughness (25-75 microns) minimum. If an existing coating is present, roughen to degloss. NRI’s composite repair systems are bond-critical and require a strong adhesive bond between the clean pipe and the composite system.


Installation of the Scar-Guard composite repair system shall be performed by NRI qualified applicators only. Surface preparation, mixing of epoxy, material saturation, and installation of the system shall be in accordance with NRI’s product specific installation guides, latest revision. Quality control inspection during and after installation of the system shall be performed per NRI’s Installation Validation Procedure: Quality Control Records, latest revision.

Cleanup and Safety

For proper information regarding the safe handling, storage, and disposal of chemical products, users shall refer to the most recent SDS, latest revision, containing physical, ecological, toxicological, and other safety-related data.

Shelf Life

  • Epoxy:12 months with proper storage
  • Polyurethane System: 12 months with proper storage
  • Fabric: 12 months with proper storage

Storage Conditions

  • Epoxy: store in original, unopened containers, indoors at a max temp of 95°F (35°C).
  • Fabric: store at temperatures below 100˚F (38˚C) away from moisture or any contaminants, in original packaging.
  • Pre-impregnated: Store in a cool, shaded area at an ambient temperature of 72°F (23°C)


Refer to individual data sheet for product packaging

Composite Laminate Properties

Product CategoryWorking TimeSet TimeThickness(per Layer)Resin BaseShore D Hardness
Scar-Guard FC5 to 7 min30 min0.0225″Polyurethane72
Scar-Guard SC30 to 35 min2 hr0.0225″Polyurethane74
Scar-Guard E45 to 55 min2.5 hr0.0225″Polyurethane81

Cure Schedule

Product CategoryWorking TimeSet Time
Scar-Guard FC5 to 7 min30 min
Scar-Guard SC30 to 35 min2 hours
Scar-Guard E45 to 55 min2.5 hours

Please see below a list of ScarGuard related videos:


The Scar-GuardTM line of products is patented and designed to protect field joint coatings from the abrasion stresses and scarring of directional drilling, HDD and boring. Scar-Guard creates an abrasion resistant, sacrificial outer laminate which protects pre-approved field joint coatings such as epoxies, shrink sleeves, and cold or hot applied tapes. Controlled set times, packaging and extreme conformability provide for fast installations in any project environment. The Scar-Guard line of products minimize the need for costly spot repairs after a pull back and provide long-term protection of underlying field joint coatings.

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