Technical Data Sheet
| Document | RY-TDS-102 |
|---|---|
| Revision | Rev. 1.0 |
| Issue date | July 2026 |
| Status | Issued |
Rayson PrimeBond · Primers & bonding coats
Rayson PrimeBond E25 is a two-component, medium-viscosity, solvent-free epoxy bonding primer for dry or damp substrates — formulated to wet out and anchor to highly absorbent concrete, screed, asphalt and prepared metal.
PrimeBond E25 pairs a milky epoxy resin with an amber-brown hardener into a medium-viscosity, solvent-free primer built for absorbency: on thirsty concrete and screed it soaks in and seals the surface rather than sitting on top, giving the floor system above it the grip it depends on.
Primer.
Figure 1 — Typical system build-up (top to bottom). Layer thicknesses are system-dependent; confirm the specification for your project.
| Surface preparation | Substrate must be sound, clean and free of oil, grease, laitance, loose material and bond-inhibiting contaminants. Prepare concrete mechanically (captive shot blasting, milling or diamond grinding); remove weak concrete, open blowholes and voids, and reinstate imperfections with a suitable Rayson repair product. Vacuum all dust. New concrete should be at least 28 days old. |
|---|---|
| Mixing / dilution | Two pre-weighed parts, mix ratio 4:1 (A:B) by weight; mix mechanically for at least 2–3 minutes; pot life up to 30 minutes at 30 °C |
| Application method | Roller, Brush, Airless spray |
| Coverage | 6–8 m² per kg per coat, varying with substrate condition and porosity |
| Application conditions | Minimum substrate temperature 5 °C; substrate moisture content max 5%; minimum mixing temperature +10 °C; cure between +10 °C and +35 °C; prepared substrate pull-off strength above 1.5 N/mm². |
| Drying & curing | Final cure 7 days |
| Recoat interval | Overcoat within the system recoat window once the primer is touch dry; timings temperature-dependent. |
| Film / thickness | Applied as a penetrating primer coat; consumption governs film — see coverage. |
| Pack sizes | Part A 4 kg / Part B 1 kg per set, or Part A 16 kg / Part B 4 kg per set |
| Storage | Minimum 12 months at 5–35 °C in unopened original packaging; protect from direct sunlight. |
| Shelf life | Approximately 12 months unopened, subject to storage conditions. |
Figure 2 — Application workflow. Each stage is a hold point: confirm the previous stage is complete and within specification before proceeding.
Standard primed floor system
Absorbent-substrate system
Two-component product. Wear gloves, eye protection and suitable respiratory protection where ventilation is limited. Avoid skin and eye contact. Keep out of reach of children. Consult the Safety Data Sheet (in preparation) before use.