RomoCoat 1256 HB Mastic Epoxy Paint
RomoCoat 1256‑HB Mastic Epoxy is a fast‑drying, high‑solids, surface‑tolerant epoxy mastic for heavy‑duty protection of steel and concrete in aggressive industrial and marine environments.
Product description
- Two‑component, high‑build, polyamide‑adduct cured epoxy mastic with very high volume solids (~80%) and excellent wetting properties.
- Forms a very hard, tough yet flexibilised coating that cures even at relatively low temperatures and tolerates marginally prepared substrates (within limits).
- Can act as self‑priming coat, intermediate, or finish coat in low‑VOC, high‑build heavy‑duty systems.
Typical applications
Marine & offshore (ballast tanks, underwater hull, splash zone)
Industrial & coastal structural steel
Heavy‑duty maintenance coating (surface‑tolerant)
Immersion & water/waste‑water service (where specified)
New‑build steel where low VOC + high build are needed
Product Data Sheet
| Property | Details |
|---|---|
| Mixing ratio | 4 : 1 by volume (Base : Hardener). |
| Pot life | 4–5 hours at 30°C. |
| Application methods | Airless spray, brush (roller possible for touch‑up / small areas). |
| Volume solids | Approx. 80%. |
| Finish | Egg‑shell |
| Colour | grey |
| Recommended DFT per coat | 80–100 µm.. |
| Theoretical spreading rate | 10.00–8.00 m²/L at 80–100 µm DFT |
| Drying & curing (30 °C) | Touch dry: 3–3.5 hours. Hard dry: ~16 hours. Fully cured: ~7 days. |
| Overcoating interval | Minimum: 16 hours at 30 °C |
| Flash point | Above 23 °C. |
| Thinner | Thinner‑1256 dedicated epoxy mastic thinner. |
Surface Preparation
- Because it is surface‑tolerant, requirements are slightly relaxed compared to conventional epoxies, but proper cleaning is still critical:
- General requirement:
- Surface must be dry, and free from oil, grease, salts, dust and loose rust/paint; high‑pressure fresh‑water wash often recommended before mechanical prep.
- For best performance (new steel):
- Abrasive blast cleaning to Sa 2½ with suitable profile is preferred, especially for long‑life systems and immersion/ballast tank service.
- Maintenance / marginal prep situations:
- Power‑tool cleaning or St 2/St 3 (wire brushing, needle gunning, grinding) to remove loose rust and poorly adhering coatings, leaving sound, tightly adherent substrate and firm old coating.
- Suitable for application over sound, aged epoxy, inorganic zinc silicate, and some other coatings after proper cleaning and roughening.
- Recoating / max interval:
- The indicated maximum recoating interval (4 weeks) applies to overcoating with itself or compatible topcoats.
- At long recoat intervals, surface must be clean (no chalking, salts, oil) and roughened (light sweep‑blast or sanding) before further coats.
- General requirement:
Application guidance
-
- Mix base and hardener at 4:1 by volume; power‑mix until homogeneous, scraping sides and bottom of container.
- Allow any specified induction time if your internal standard requires (often not necessary with mastic epoxies, but follow in‑house QC).
- Adjust viscosity with Thinner‑1256 only as required; avoid over‑thinning as this reduces film build and may affect sag resistance and tolerance.
Airless spray (preferred):
- Typical nozzle: 0.017″–0.021″ (per your internal spec), high‑pressure pump (e.g. 180–230 bar) for high‑build application.
- Apply in one or two passes to achieve 80–100 µm DFT per coat; avoid excessive single‑coat build beyond spec to prevent internal stress and potential cracking, especially in ballast tanks.
Brush:
- Use for touch‑up, edges, welds, small areas and stripe coats; ensure required DFT is achieved, often requiring two passes.
Systems examples:
- Immersion / ballast tanks:
- 2–3 x RomoCoat 1256‑HB Mastic Epoxy to achieve total 200–300 µm DFT, or
- 1–2 x 1256‑HB + compatible epoxy tie‑coat / antifouling as per spec.
- Atmospheric C4–C5:
- 1 x RomoCoat 1256‑HB (self‑priming) → 1 x 1256‑HB or PU topcoat, or
- 1 x zinc‑rich primer → 1 x 1256‑HB → PU finish for maximum life.
Health & Safety
- Avoid inhalation of solvent vapours and paint mist; avoid contact with skin and eyes. Use appropriate PPE: organic vapour respirator, gloves, safety goggles and protective clothing as per local regulations.
- Provide forced ventilation when working in confined spaces or areas with stagnant air (ballast tanks, hull internals, closed rooms).
- Follow MSDS for first aid, spill control and disposal; do not discharge into drains or watercourses.
Storage
- Store in a cool, dry, well‑ventilated place, away from direct sunlight, heat and open flames.
- Keep containers tightly closed when not in use; avoid moisture ingress into hardener and base.
- Shelf life is typically 12 months in unopened original containers under recommended conditions (confirm via internal QC label).