Technical Data Sheet
| Document | RY-TDS-101 |
|---|---|
| Revision | Rev. 1.0 |
| Issue date | July 2026 |
| Status | Issued |
Rayson PrimeBond · Primers & bonding coats
Rayson PrimeBond E20 is a two-component, medium-viscosity, solvent-free epoxy bonding primer that anchors resin floor systems to concrete, screed, asphalt and prepared metal — on dry or damp substrates.
PrimeBond E20 is the workhorse primer of the Rayson range. A medium-viscosity, solvent-free two-component epoxy, it penetrates mechanically prepared substrates and forms the adhesion bridge that the rest of the floor system depends on. In pull-off testing on properly prepared concrete, bond strength exceeds the cohesive strength of the concrete itself — failure occurs in the substrate, not the primer.
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 2:1 (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 once the primer is touch dry and within the system recoat window; timings temperature-dependent. |
| Film / thickness | Applied as a penetrating primer coat; consumption governs film — see coverage. |
| Pack sizes | Part A 13.34 kg can + Part B 6.66 kg can |
| 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 epoxy floor system
Repair-then-coat 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.