Selection reference
Choose a Prime Resins injection resin by job
Prime Resins products split by what the repair has to do. Polyurethane grouts react with water and expand to stop the flow; epoxy injection resins bond the crack faces back together. Start from the condition of the crack or void, then confirm the specification, the injection method and the cartridge ratio.
| Job | What to confirm | Stocked products |
|---|---|---|
| Active leaks in tight and hairline cracks | Confirm the crack is actively wet, that ports and a pump or cartridge gun are available, and the injection sequence. This single-component hydrophilic resin is water-activated and can be injected on its own or twin-stream with water; no catalyst is required. | Prime Flex 900 XLV, surface mount ports |
| High-flow leaks and wide gaps | Confirm the structure is not subject to movement, that water is present to drive the reaction, and the catalyst dose. Prime Flex 920 is hydrophobic and super low viscosity; reaction time is set by the Prime Kat or Kick Fast ratio, to a maximum of 10% by volume. | Prime Flex 920 10:1 cartridge, Kick Fast |
| Voids under slabs and behind structures | Confirm the void volume, the access holes and that the surrounding material can take the expansion pressure. Prime Flex 985 5.0 is a two-component, high-density closed-cell structural foam in a 1:1 cartridge and is moisture insensitive. | Prime Flex 985 1:1 cartridge |
| Structural crack repair in dormant cracks | Confirm the crack is no longer moving, the specified ASTM C-881 type, grade and class, the surface seal method and the pot life at site temperature. Prime Rez 1100 conforms to ASTM C-881 Type I and II, Grade 1, Class B and C, and tolerates damp conditions. | Prime Rez 1100 High Mod LV |
| Cracks subject to shock or vibration | Confirm that the specification calls for a low-modulus resin rather than a high-modulus one. Prime Rez 1200 conforms to ASTM C-881 Type II and III, Grade 1, Class B and C, and is the lower-viscosity, higher-elongation member of the pair. | Prime Rez 1200 Low Mod LV |
| Ports, mixers and catalyst | Match the mixer count to the cartridge count and the port type to the injection pressure. Cartridge ratios differ by product: 10:1 for Prime Flex 920, 2:1 for the Prime Rez epoxies and 1:1 for Prime Flex 985. | Surface mount ports, static mixers, Kick Fast catalyst |
| Pails, drums and the wider Prime Resins line | Bulk polyurethane and epoxy units, acrylate resins, slab lifting foams, hydro gels, pumps and dispensing guns are not held in stock but can be ordered or drop shipped. Send the product name and quantity with the required date. | Request a special order |
Published strengths, viscosities, expansion and reaction times apply only at the stated test method, mix ratio and temperature. Use the current Prime Resins data sheet before approving a substitution or writing a value into a submittal.
Field notes
Plan the injection before you buy the resin
Most failed injections are selection and setup problems rather than material problems. These four decisions do most of the work on a leak sealing or crack repair job.
Hydrophobic or hydrophilic polyurethane
Prime Flex 920 is hydrophobic: it reacts with the water it meets and cures to a closed-cell rigid foam, which suits gushing leaks and wide gaps where the structure is not moving. Prime Flex 900 XLV is hydrophilic, low viscosity and flexible once cured, which suits tight and hairline cracks and joints that still breathe.
Both are single component and water activated. Neither is a structural repair; they stop water. If the crack also has to carry load again, the repair is an epoxy.
Epoxy or polyurethane
Prime Rez 1100 and 1200 are 100% solids, two-component epoxies injected or gravity fed into dormant cracks in concrete, masonry or stone to restore a monolithic section. Prime Rez 1100 is the high-modulus, high-strength choice; Prime Rez 1200 is very low viscosity with far greater tensile elongation, for cracks subject to shock or vibration.
An actively leaking crack is generally sealed with polyurethane first. Epoxy needs the crack faces clean and the surface sealed, and the data sheets warn against use below 32°F, where ice in the concrete prevents bond.
Ports, guns and pumps
Quick Mix cartridges dispense through a static mixer with a standard cartridge gun matched to the ratio, so confirm that the gun on the truck is the right one before anyone mobilizes. Surface mount ports suit low-pressure work; higher pressures call for mechanical ports.
Order mixers with the resin. A mixer is consumed per cartridge or per stoppage, and a job stops when they run out. Equipment is flushed with Prime Flex Eco Flush per the data sheets.
Temperature, catalyst and pot life
Prime Flex 920 needs Prime Kat or Kick Fast catalyst to set its reaction time, up to a 10% maximum ratio by volume; the 10:1 cartridge arrives with Kick Fast already in the B tube. Bulk material is mixed with a low-speed drill and paddle, not by hand or by shaking.
Epoxy pot life moves sharply with temperature. Prime Rez 1100 gives roughly 29 minutes per 100 g at 73°F and about 15 minutes at 90°F, so condition material and plan batch sizes against the temperature on the day.
Before you order
Quantities, specifications and special orders
Use the project specification and the current manufacturer data to confirm the product, the quantity and the documents the job needs.
Match the specified resin
Where a specification cites ASTM C-881, read the type, grade and class together rather than the product name alone. Prime Rez 1100 is published as Type I and II, Grade 1, Class B and C; Prime Rez 1200 as Type II and III, Grade 1, Class B and C. For polyurethanes, check whether the spec calls for hydrophobic or hydrophilic chemistry.
Estimate cartridges and ports
Estimate crack volume from length, width and depth, and void work from measured volume, then add an allowance for loss into the substrate. Count ports at the planned spacing and one mixer per cartridge, and confirm coverage against the current data sheet before ordering a full case.
Order what we do not stock
We stock the cartridge line and can order or drop ship the rest of the Prime Resins range, including pails, drums, acrylates, slab lifting foams, pumps and dispensing equipment. Send the product name, size and quantity with the required date and we will price it and confirm lead time.
Project orders
Request Prime Resins project pricing
Send the products and quantities for your leak sealing, crack injection or void filling scope. If you need a pail, drum or any Prime Resins product not listed on this page, include it here and we will quote the special order.
Include with your request
- Product name, size and quantity, or the specification section
- Crack width and length, or void volume and depth
- Active leak, damp or dry, and the structure type
- Ports, mixers, guns or pumps needed
- Delivery ZIP and required-on-site date
Prime Resins questions
What is the difference between polyurethane and epoxy injection?
Polyurethane injection resins react with water and expand into a foam that fills and seals the crack, which is why they are used to stop active leaks. Epoxy injection resins are two-component structural adhesives that bond the crack faces and restore a monolithic section, which is why they are used on dormant cracks. A leaking crack that also needs structural repair is usually sealed first and repaired afterward.
Prime Flex 900 XLV or Prime Flex 920 — which one?
Prime Flex 900 XLV is a hydrophilic, low viscosity resin for actively leaking joints and cracks, including hairline cracks, and cures to a tough, flexible foam. Prime Flex 920 is hydrophobic and super low viscosity, used on high-flow leaks and wide gaps in concrete that is not subject to movement, and also for permeation grouting of loose soils. 920 requires catalyst; 900 XLV does not.
Prime Rez 1100 or Prime Rez 1200?
Prime Rez 1100 High Mod LV is the high-strength, high-modulus epoxy, published at 8,540 psi compressive and 5,110 psi tensile with 6.4% elongation, and it tolerates wet conditions. Prime Rez 1200 Low Mod LV is lower in viscosity at 70 to 90 centipoise and much higher in elongation at 35%, and the data sheet directs it at cracks subject to shock or vibration. Both mix 2:1 by volume and both are 100% solids with no VOCs.
Do I need a catalyst with Prime Flex 920?
Yes. Prime Flex 920 requires Prime Kat or Kick Fast to set its reaction time, and the maximum dose is 10% by volume. The 10:1 Quick Mix cartridge stocked here arrives with Kick Fast already in the B tube. For bulk material, one 33 oz bottle per 5 gallons is a 5% ratio and two bottles is the 10% maximum, and only what can be used within 12 hours should be mixed.
What gun do the Quick Mix cartridges need?
Each cartridge needs a gun matched to its ratio and a static mixer fitted to the nozzle. Prime Flex 920 is a 10:1 cartridge, the Prime Rez epoxies are 2:1, and Prime Flex 985 is a 1:1 cartridge that dispenses with any 300 ml by 300 ml cartridge gun. Order mixers with the resin, since one is used per cartridge.
Can you supply Prime Resins products that are not listed here?
Yes. The products on this page are what we stock. The rest of the Prime Resins line, including pails and drums, acrylate resins, hydro gels, slab lifting foams, pumps and dispensing guns, can be special ordered or drop shipped. Send the product and quantity through the project pricing request and we will confirm price and lead time.
Can these resins be used in potable water or wet conditions?
Wet tolerance and any potable-water or agency approval are product specific, and a claim on one Prime Resins product does not carry to the rest of the line. Prime Rez 1100, for example, is published as tolerant of wet conditions and able to be injected under water. Ask us for the current data sheet for the exact product before writing an approval into a submittal.
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