Which port setting paste should I use for epoxy or polyurethane injection?

Choose paste by cure speed. The 903 paste has a 3 to 4 hour cure time and is standard in NextStar DIY kits. The 302 paste cures in 45 to 75 minutes and is preferred by contractors for single-visit jobs. The 901 paste is 60 to 90 minutes. The 900 paste cures in 20 to 30 minutes and is for experienced contractors only due to its short pot life.

What epoxy viscosity should I use for my crack width?

Use ULV or LV epoxy for hairline cracks under 1/32 inch. Use MV for cracks from 1/32 to 1/4 inch. Use HV for cracks from 1/8 to 3/8 inch. Use EHV or E-101 paste for cracks wider than 3/8 inch. All are ASTM-C881 compliant and cure to 12,000 PSI bond strength.

What is the difference between NextStar 102 and 103 polyurethane foam?

NextStar 102 is a water-activated hydrophobic foam for standard non-structural leaking cracks from 1/32 to 3/8 inch wide. It expands 20 times on contact with water. NextStar 103 is a closed-cell foam for wider cracks over 1/8 inch and does not require water activation, making it suitable for drier conditions or wider gaps.

What are auto-injector capsules and when should I use them?

Auto-injector capsules are 40mL spring-loaded capsules that attach to surface ports and deliver continuous 35 to 40 PSI pressure for up to 24 hours without manual pumping. They are included in NextStar DIY kits and are ideal for slow-setting epoxy and polyurethane injection where sustained pressure improves penetration depth.

How do I stop an actively leaking crack before injecting polyurethane?

Use Koster KD2 Blitz hydraulic water stop powder. It sets in seconds on wet or actively leaking concrete surfaces and can be applied directly into the crack or around the crack face to stop water flow before installing ports and injecting polyurethane foam.

Category List

• Concrete Foundation Crack Repair kits

Polyurethane Crack Injection kits
Epoxy Crack Injection kits

• Supplies & Refills

Surface Paste, Mixers ,Ports
Epoxy Injection Products
Polyurethane Foam Products

• Concrete Floor Repair

Roadware Products
Concrete Slab Repair kits

• Carbon Fiber Reinforcement

• Tools

• High Pressure Crack Injection

• Testing & Measurement

• Sump Pumps

• Concrete Sealers / Radon

• Crawl Space Sealing

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Supplies & Refills

Crack Injection Supplies — Ports, Pastes, Mixers & Refills

Individual components and refills for low-pressure and high-pressure concrete crack injection systems — epoxy and polyurethane. Port setting pastes, surface ports, static mixers, auto-injectors, and resin refills.

Surface Ports, Pastes & Static Mixers

Port Setting Pastes — 903 (3–4 hr, DIY), 302 (45–75 min, contractor), 901 (60–90 min),455 (20–45 min, pro). Choose by cure speed.
Surface Injection Ports — standard, corner (wall–floor joints), extra low-profile (tight access), and pound-in types.
Auto-Injector Capsules — 40mL, deliver continuous 35–40 PSI for 24 hours. No pumping required.
Static Mixers & Nuts — for 300ml and 600ml dual-component cartridges. Compatible with all NextStar epoxy and polyurethane products.
Feed Hose Assembly — with shutoff valve for hard-to-reach injection locations.
Crossover Back-Flow Restrictors — prevent cross-contamination in dual-component cartridges. Save unused product between jobs.

Epoxy Injection Products — Structural Crack Repair

ASTM C881 low-pressure epoxy tube sets for structural foundation crack repair. Choose viscosity by crack width:

LV (Low Viscosity) — hairline cracks under 1/32". Wicks into fine cracks, protects rebar.
ULV #4 (Ultra-Low Viscosity) — for cracks too fine for standard LV. Flows for up to 12 hours.
MV (Medium Viscosity) — 1/32" to 1/4" cracks. Cures to 32°F.
HV (High Viscosity) — 1/8" to 3/8". Non-sag on vertical surfaces.
EHV (Extra High Viscosity) — cracks wider than 3/8". Paste consistency.
E-101 Injection Paste — for very wide cracks. Prevents drainage after injection pressure is removed.

Shop all Epoxy Injection Products →

Polyurethane Foam Products — Waterproofing & Leak Repair

Polyurethane foam injection supplies for leaking concrete foundation cracks. Expands on contact with water to seal from within.

NextStar 102 — standard hydrophobic foam for non-structural leaking cracks 1/32" to 3/8". 20× expansion.
NextStar 103 — closed-cell foam for cracks wider than 1/8". No water activation required.
NextStar 120 Structural Foam — for wide cracks, large voids, and wall–floor joints.
Koster 2-in-1 Polyurethane — reacts as foam with water or cures as elastic resin without. For moving and repeat-repair cracks.
Koster KD2 Blitz Water Stop Powder — sets in seconds on wet concrete. For emergency leak control before injection.

Shop all Polyurethane Foam Products →

Sub Categories

Surface Paste, Mixers ,Ports

Parts used with low-pressure and high-pressure concrete crack injection.Plastic surface ports, Static mixers for Polyurethane and Epoxy products, requiring accessories for cartridge dispensing.

Epoxy Injection Products

Epoxy Crack injection products for concrete foundation structural crack injection repair via low-pressure injection methods such as low viscosity epoxy, medium viscosity epoxy, ultra low viscosity epoxy type 1, 4

Polyurethane Foam Products

Polyurethane Foam supplies for concrete foundation crack injection usually for leaking concrete cracks. Polyurethane expands to fill cracked concrete used for waterproofing.

Category Items

Polyurethane 102 Injection Foam for Non-Structural Cracks

Standard hydrophobic polyurethane for stopping leaks in non-structural poured concrete wall cracks, 1/32" to 3/16". Expands up to 20× into a flexible closed-cell foam that stays sealed through freeze/thaw. Set includes nut and static mixer.

NX2102

$42.00 USD ($55.99 CAD)

InStock

Polyurethane 103 Injection Foam for Wider Cracks

Heavier-density closed-cell polyurethane for wider cracks, 3/16in to 1/2in, and void fill. Self-reacting, fast-curing, and compression-resistant — stays watertight even if the cured skin is cut. Set includes nut and static mixer.

NX2103

Regular Price: $39.00 USD ($51.99 CAD)
Sale Price: $28.00 USD ($37.32 CAD)

InStock

Polyurethane 120 Structural Foam Tube set

Strongest structural injection polyurethane — a 12 lb high-density two-part foam for large structural cracks over 1/2", pipe penetrations, and void fill. Used with carbon fiber, it handles structural repairs for about half the material of epoxy.

NX2120

$42.00 USD ($55.99 CAD)

InStock

Koster 2n1 Polyurethane Individual Tubeset Dual 600ml

Koster 2In1 resin polyurethane for low-pressure injection that will either react when contact with water or cure as an elastic resin without contact with water. Great for leaking foundation crack injections that have been repaired previously.

NX2124

$48.00 USD ($63.98 CAD)

InStock

ULV #4 Ultra Low Viscosity Epoxy For Super Small Cracks

Ultra-low viscosity epoxy injection product for the very fine crack repair of hairline cracks. Packaging options available.Gravity feed epoxy.

NX2302

$45.25 USD ($60.32 CAD)

InStock

Epoxy Low Viscosity Tubeset

LV Low Viscosity fast setting Low Temperature Epoxy for low pressure concrete crack injection designed to structurally repair cracks generally less than 1/32 of an inch wide and will cure down to 32 deg F.

NX2304

$39.00 USD ($51.99 CAD)

InStock

Epoxy Medium Viscosity Tubeset

Introducing our MV Medium Viscosity fast setting Epoxy, designed for low pressure concrete crack injection. This product is perfect for structurally repairing cracks ranging from 1/32 to 1/4 inch, with a low temperature epoxy cure down to 32 Deg F.

NX2306

$39.00 USD ($51.99 CAD)

InStock

Epoxy High Viscosity Tubeset

HV High Viscosity fast setting Epoxy is a thick low-pressure injection repair product designed for wider concrete crack repair. This product is perfect for repairing structural cracks, with a low temperature epoxy cure down to 32 deg F.

NX2308

$42.00 USD ($55.99 CAD)

InStock

Epoxy Extra High Viscosity

EHV Extra High Viscosity fast setting epoxy is a extra thick low pressure concrete crack injection repair product designed to structurally repair wider concrete cracks, low temperature cure down to 32 deg F.

NX2310

$48.00 USD ($63.98 CAD)

InStock

Epoxy Injection Paste

E101 Epoxy Paste is a thick low pressure injection repair product designed to structurally repair a very wide crack 1/4 inch or wider and is compatible with other epoxy crack injection products.

NX2312

$38.00 USD ($50.65 CAD)

PreOrder

20 Min Fast Epoxy Port Surface seal

NextStar 900 20-minute very fast port setting epoxy paste. Ideal for contractors that need to complete the foundation injection in one visit. No waiting around to set ports or sealing overcracks.

NX2800

$39.00 USD ($51.99 CAD)

InStock

Paste 903 Port Setting Epoxy 600 ml Cartridge

3-4 hour slow setting port sealing paste epoxy. Used primarily for bonding injection ports on to concrete and general surface sealing over cracks before injection. Standard in Nextstar Kits. DIY friendly.

NX2802

Regular Price: $35.00 USD ($46.66 CAD)
Sale Price: $27.00 USD ($35.99 CAD)

InStock

Paste 302 Port Setting Epoxy 600ml Cartridge

45-75 Min fast setting port sealing epoxy paste is used for setting surface ports in place and general sealing over cracks before injection. High strength, Contractor’s preferred choice.

NX2803

$52.00 USD ($69.32 CAD)

InStock

Port Low Pressure STANDARD Surface Crack Injection

Injection ports for low-pressure concrete crack injection. Can be injected directly from a mixer or a feed hose. Use with all epoxy and polyurethane cartridge products.

NX2810

$0.85 USD ($1.13 CAD)

InStock

Port Low Pressure CORNER Crack Injection

Injection corner ports for low-pressure injection repairs in the corner or drilled injection locations. Can be used with all Epoxy and Polyurethane products.

NX2812

$0.90 USD ($1.20 CAD)

InStock

Port Low Pressure Extra Low Profile Crack Injection Surface

Extra-low profile surface port for low-pressure crack injection. Use where the ports cannot protrude from the surface.Behind or hard to access areas.

NX2814

$1.55 USD ($2.07 CAD)

InStock

Pound-in Port Low Pressure

Pound-in ports for low-pressure concrete crack injection. Used with epoxy and polyurethane resins to deliver material deep into cracks. This is essential for foundation repair and waterproofing projects. DIY and professional use.

NX2815

$2.00 USD ($2.67 CAD)

InStock

Auto Injector for Polyurethane & Slow Setting Epoxy

NextStar 40mL Low-Pressure auto-injectors. Delivers continuous 35-40 PSI for 24 hours to drive polyurethane & epoxy deep into foundation cracks.

NX2816

Regular Price: $2.00 USD ($2.67 CAD)
Sale Price: $1.15 USD ($1.53 CAD)

InStock

75mL Spring-Driven Concrete Crack Injector

Automate structural concrete repairs with this heavy-duty, spring-driven syringe. It delivers continuous low pressure to drive epoxies deep into hairline cracks, eliminating manual pumping and maximizing job site efficiency.

NX2817

$3.00 USD ($4.00 CAD)

InStock

Nut for Static Mixer 9 Pitch Dual Cartridges

Nut for attaching static mixers to all epoxy or polyurethane foams in dual tube sets.

NX2818

$0.75 USD ($1.00 CAD)

InStock

Static Mixer Selector for dual cartridge tubes

Choose the right tube mixer for epoxy or polyurethane foam products. Fits standard dual-component cartridges like 102, e555, 10-minute mender, and most brands.

NX2820

$2.40 USD ($3.20 CAD)

InStock

Crack Injection Feed Hose for Epoxy & Polyurethanes

Low pressure crack injection feed hose assembly for hard to reach areas or extended injection time. Fits on the end of the standard mixer tube.

NX2821

$9.00 USD ($12.00 CAD)

InStock

Dual 300x300mL Cartridges Set of 5

The standard dual 300x300ml 16oz x 2 cartridge is the standard in the construction industry, Set of 5 with caps, retaining nuts, and pistons. requires a standard mixer to be added.

NX2823

$30.00 USD ($39.99 CAD)

InStock

Crossover Flow Restrictors for Dual Component Dispensing

The cross-over back-flow restrictor eliminates cartridge cross contamination between side of a dual cartridge system. This allows unused product to be used later without contamination.

NX2824

$1.00 USD ($1.33 CAD)

InStock

Koster KD2 Blitz Water Stop Powder 2.2lb Box

Fast Emergency water stop for cracks or holes that are actively leaking. KD2 Blitz powder sets in seconds and is perfect for the setting of ports. Can apply to a wet wall before injection. 2.2 lb 1 Kg box.

NX2830

$22.00 USD ($29.33 CAD)

InStock

Koster KD2 Blitz Fast Water Stop Powder 33lb Pail

Fast Emergency water stop for cracks or holes that are actively leaking through concrete walls. KD2 Blitz powder sets in seconds and is perfect for the setting of ports. Can be applied to wet walls before injection. 33lb pail.

NX2833

$219.00 USD ($291.93 CAD)

InStock

HM 300 Grouting Trowelable Epoxy 1 Gallon Kit

1-gallon Epoxy set for grouting block wall cracks and repair general structural mortar repair.

NX2835

$161.00 USD ($214.61 CAD)

PreOrder