Description
When speed matters and preserving the stone's original color is non-negotiable, Tenax Epoxart Kit 4:1 is the professional's choice. Its 7–8 minute gel time and 6–8 hour polish-ready cure (at 77–95°F / 25–35°C) get you back to grinding, polishing, or installing faster — while its natural-effect formulation leaves the stone looking exactly as it should. No darkening, no tinting, no color shift. Combined with good UV stability and superb cold reactivity, this is the go-to epoxy for high-volume fabrication shops and white or color-sensitive materials.
Key Features
- Fastest cure in the Epoxart line — 7–8 min gel time; polish or cut in 6–8 hrs at 77–95°F (25–35°C)
- Natural effect — formulated to leave stone color unchanged; the pick for white materials sensitive to halos
- Thickest consistency of the three — runny-honey body stays on the surface and in the repair; does not migrate into surrounding stone
- Good UV stability — suitable for outdoor stone surfaces and sun-exposed installations
- Superb cold reactivity — cures reliably in cold shop or jobsite environments
- Medium hardness — Shore D 78–80; balanced flexibility to resist re-cracking under load
- Batch small — 7-min pot life means mix only what you can spread in ~5 min
Cure Times (from Tenax TDS rev 03, 09/2025)
- Gel time in cup @ 77°F (25°C): 7–8 min
- Tack-free @ 77°F (25°C): 100–110 min
- Ready to polish/cut @ 77–95°F (25–35°C): 6–8 hrs
- Ready to polish/cut @ 59–77°F (15–25°C): 24–48 hrs
- Minimum cure temp: 59°F (15°C)
- Service range after cure: -13°F to 140°F (-25°C to +60°C)
Ideal Applications
- Production environments requiring fast turnaround — get the slab back in the line this shift
- White and light-colored stone sensitive to halos or resin migration
- Surface consolidation and facework where body and fill are needed
- Cold-weather fabrication and outdoor jobsite applications
- Outdoor stone surfaces, pavers, and cladding exposed to sunlight
Epoxart Kit A+B — Which Ratio Do You Need?
Same proven Tenax epoxy chemistry, three cure profiles. Every kit includes Part A (resin) and Part B (hardener) — always mixed together by weight. All three cure to the same hardness (Shore D 77–80). The difference is cure speed, flow, and sunlight stability.
| Spec | 2:1 | 3:1 | 4:1 ★ |
|---|---|---|---|
| Mix ratio (A : B, by weight) | 2 : 1 | 3 : 1 | 4 : 1 |
| Mixed consistency | Thin syrup — very fluid, wets out mesh and laminations | Thin syrup — thinnest of the three, deepest soak-in | Runny honey — stays where you put it |
| Working time in the cup — 77°F (25°C) | 55–75 min | 150–180 min | 7–8 minutes |
| Tack-free — 77°F (25°C) | ~240 min | 300–360 min | 100–110 min |
| Ready to polish / cut — shop temp 77–95°F (25–35°C) | 8-24 hrs | 24–48 hrs | 6–8 hrs |
| Ready to polish / cut — cool shop 59–77°F (15–25°C) | 48 hrs | 48–72 hrs | 24–48 hrs |
| Sunlight stability (3-yr Xenon test, ISO 11341) | Medium-good — made for laminated & colored work | Good — best of the three | Good |
| Best for | Crack repairs, lamination, fiberglass netting, colored materials | Porous / fractured stone, outdoor work | Production speed, halo-sensitive white materials |
| Cured hardness (Shore D) | 77–80 | 78–80 | 78–80 |
| Minimum shop temp to cure | 59°F (+15°C) — all kits | ||
| Service temp after full cure | -13°F to 140°F (-25°C to +60°C) — all kits | ||
Every kit, every time:
- Mix Part A + Part B by weight, not volume — the ratio is in the kit name.
- Stone must be completely dry and clean before resining.
- 4:1 users: mix only what you can apply in about 5 minutes. Pot life is 7–8 minutes at 77°F (25°C).
- Never use PVC containers; keep resin away from copper and brass.
- Gloves and safety glasses required. See the SDS before use.
- Store sealed in original containers at 68–77°F (20–25°C). Do not let the resin freeze. Shelf life 24 months.
Data: Tenax S.p.A. technical data sheets rev 03 (03/09/2025). Laboratory values, indicative — always test on your specific material.
Kit Contents
- Epoxart A-1006 — 1 kg (Resin, Part A)
- Epoxart B-BB25 — 0.25 kg (Hardener, Part B)
- Total kit weight: 1.25 kg
- Mix ratio: 4 parts resin : 1 part hardener (by weight)
How to Use
- Clean and thoroughly dry the stone surface — remove all dust, oils, and debris.
- Measure by weight: 4 parts resin (Part A) to 1 part hardener (Part B).
- Mix thoroughly using clean corrosion-resistant plastic tools — never PVC, copper, or brass.
- Apply wearing safety gloves and glasses. Work fast — 7–8 min pot life.
- Reseal containers immediately; never let the resin freeze.
Storage & Shelf Life
- Store below 35°C (95°F), away from heat, direct sunlight, humidity, and freezing
- Shelf life: 24 months sealed at 68–77°F (20–25°C)
Not sure which Epoxart ratio is right for your job?
Read our full comparison: Tenax Epoxart 2:1 vs 3:1 vs 4:1 — Which Stone Epoxy Ratio Do You Actually Need?
Choosing the Right Epoxart Kit
- Epoxart Kit 2:1 — very fluid, high-adhesion; best for lamination, fiberglass netting, and colored materials
- Epoxart Kit 3:1 — thinnest flow, longest open time; best for porous/fractured stone and outdoor work
- Epoxart Kit 4:1 (this product) — fastest cure, natural effect; best for production speed and white/color-sensitive stone
Works Well With
- Tenax Epoxart Kit 2:1 — use for lamination and fiberglass netting applications
- Tenax Epoxart Kit 3:1 — when extended working time and maximum penetration are needed
- Tenax Fixtop Knife Grade Epoxy — knife-grade 2-part epoxy for bonding and laminating stone
- Tenax Mixing Cups 12oz (50/Sleeve) — disposable cups for measuring and mixing epoxy components
- Tenax Colored Knife Grade Polyester — for surface chip and void repairs after slab reinforcement
Technical data from Tenax S.p.A. technical data sheets rev 03 (03/09/2025). All values are laboratory results and indicative; always test on your specific material.