What it is and why choose it
Seajet 117 Multipurpose Epoxy Primer Part A is a high performance, two-component epoxy primer designed to protect GRP (fibreglass), aluminium, steel hulls, metal keels and wood. Applied in multiple roller coats, it provides durable osmosis protection for boats and can be directly overcoated with Seajet antifoulings and compatible two-component topcoats. Its high solids content and excellent adhesion make it an ideal first coat both below and above the waterline.
Main features
- Two-component epoxy system: base (Part A) to be mixed with a dedicated hardener for a durable, chemically resistant coating.
- Osmosis protection for GRP: protects fibreglass hulls against osmosis when applied in 4–5 roller coats.
- Multipurpose primer: suitable as first coat on GRP, wood, steel, aluminium and aluminium alloys.
- Direct overcoating with antifouling: can be overcoated with all Seajet antifouling products.
- High solids epoxy: 45 ±2% volume solids for efficient film build and coverage.
- Marine-optimised colours: silver grey (recommended underwater) and off white (recommended above water).
- Wide application window: can be applied by airless spray, brush or roller between 5–35 °C and up to 85% relative humidity.
- Long service life in can: minimum shelf life of 3 years at 20 °C when stored correctly.
Technical specifications
Product data
- Product name: Seajet 117 Multipurpose Epoxy Primer Part A (Base)
- Type: two-pack epoxy primer base
- Colour: silver grey (preferable underwater) and off white (preferable above water)
- Volume solids: 45 ±2%
- Flash point: 32 °C (ISO 13736:2021)
- VOC (theoretical): 443 g/L
- Relative density: 1.29 (at 20 °C, ASTM D1475-98)
- Physical state: liquid, non-Newtonian, thixotropic
- Solubility: not soluble in water
- Pack sizes (set): 1 L, 2.5 L, 5 L, 20 L (base + hardener)
Mixing and thinning
- Mixing ratio (by volume): Base 67 : Hardener 33
- Mixing ratio (by weight): Base 73 : Hardener 27
- Mixing method: add hardener to base while stirring; mix thoroughly before use.
- Thinner: SEAJET THINNER E
- Thinning range (airless): 0–5% by volume
Application details
- Application methods: airless spray, brush, roller*
- Recommended film thickness per coat:
- Theoretical spreading rate: 10.0 m²/L at 45 µm DFT
- Spray equipment (airless): Graco tips 719, 619, 617, 519 (Spanish TDS also references 823; use according to equipment setup)
- Paint output pressure (airless): 15.0–18.0 MPa
- Substrates: GRP (fibreglass), wood, steel, aluminium and aluminium alloys
- Subsequent coats: all Seajet antifouling systems; Seajet 117 itself has no maximum overcoat interval with Seajet 117.
- Conditions during application:
- Ambient temperature: min. 5 °C – max. 35 °C
- Product temperature: min. 5 °C – max. 35 °C
- Substrate temperature: min. 7 °C – max. 35 °C
- Maximum relative humidity: 85% RH
- *Note: film thickness and spreading rate depend on application method. Quoted values are based on roller application.
Surface preparation
- General cleaning: degrease and clean with a cloth soaked in SEAJET THINNER E to remove all contamination.
- Bare GRP (fibreglass):
- Abrade with P80 abrasive paper, then carry out a final solvent wipe.
- Apply 2–3 coats of Seajet 117 to achieve minimum 150 µm dry film thickness (DFT).
- For osmosis protection: apply 4–5 coats.
- Bare aluminium and aluminium alloys:
- Abrade with P80 abrasive paper and clean.
- Apply 3–4 coats of Seajet 117 to achieve minimum 200 µm DFT.
- Steel hulls and metal keels:
- Abrasive blast to Sa 2½ or mechanically abrade bare areas.
- Apply 4–5 coats to achieve minimum 250 µm DFT.
Drying and overcoating times (50 µm DFT)
Indicative values, actual times increase with higher film thickness.
- At 5 °C:
- Surface dry: 1 h
- Hard dry: 12.5 h
- Minimum overcoat interval: 10 h
- Maximum overcoat interval: none (for Seajet 117 over itself); 24 h for Seajet antifouling
- Pot life: 24 h
- At 10 °C:
- Surface dry: 30 min
- Hard dry: 8 h
- Minimum overcoat interval: 5 h
- Maximum overcoat interval: none (for Seajet 117 over itself); 18 h for Seajet antifouling
- Pot life: 18 h
- At 20 °C:
- Surface dry: 25 min
- Hard dry: 5 h
- Minimum overcoat interval: 2 h
- Maximum overcoat interval: none (for Seajet 117 over itself); 10 h for Seajet antifouling
- Pot life: 10 h
- At 30 °C:
- Surface dry: 20 min
- Hard dry: 1.5 h
- Minimum overcoat interval: 1 h
- Maximum overcoat interval: none (for Seajet 117 over itself); 8 h for Seajet antifouling
- Pot life: 8 h
*Mentioned maximum overcoat interval above relates to Seajet antifouling only. Seajet 117 has no maximum overcoat interval with itself. Drying and overcoating times will increase with higher film thickness.
Storage and shelf life
- Storage conditions: store in a dry, cool, well-ventilated space away from direct sunlight and sources of ignition. Keep containers tightly closed and upright. Handle with care.
- Recommended storage temperature: between 0 °C and 40 °C.
- Shelf life: minimum 3 years at 20 °C.
Applications and use cases
- Boat hull osmosis protection: multi-coat barrier primer on GRP hulls to help protect against water ingress and osmosis.
- Underwater and topside primer: silver grey recommended below the waterline (under antifouling), off white for topsides and superstructures before finishing coats.
- Aluminium hulls and components: first epoxy coat on aluminium yachts, ribs, superstructures and fittings before compatible topcoats or antifoulings.
- Steel hulls and metal keels: high-build epoxy barrier on grit-blasted steel hulls and cast-iron or lead keels.
- Wooden boats: epoxy primer on prepared wooden hulls and decks, prior to suitable finishing systems.
FAQ – Seajet 117 Multipurpose Epoxy Primer Part A
- What substrates can Seajet 117 be applied to?
It is suitable for GRP (fibreglass), wood, steel, aluminium and aluminium alloys, provided surfaces are properly cleaned and prepared.
- How many coats are needed for osmosis protection on GRP?
For osmosis protection on GRP, apply 4–5 coats by roller to reach the recommended barrier thickness.
- Can I apply antifouling directly over Seajet 117?
Yes. All Seajet antifouling products can be applied directly over Seajet 117 within the specified overcoating intervals.
- What thinner should be used?
Use only SEAJET THINNER E for cleaning and, if required, for thinning (0–5% by volume for airless spray).
- What is the pot life after mixing base and hardener?
Pot life is approximately 24 h at 5 °C, 18 h at 10 °C, 10 h at 20 °C and 8 h at 30 °C.
- Is Seajet 117 classified as flammable?
Yes. It is a flammable liquid and vapour (Flash point 32 °C; CLP classification Flam. Liq. 3, H226).
- Does the mixed product have a strong odour?
It has a typical solvent (aromatic) odour. Adequate ventilation is required during use.
- How should leftover product and empty cans be disposed of?
Do not pour into drains. Dispose of contents and container at a hazardous or special waste collection point according to local regulations (European Waste Code 08 01 11* is referenced in the SDS).
- Is there a maximum overcoat interval for Seajet 117 over itself?
No. The SDS specifies that the maximum overcoat interval of Seajet 117 with itself is free; only overcoat intervals towards Seajet antifouling are limited.
- What happens if higher film thicknesses are applied?
Drying times and overcoating intervals will increase when higher film thicknesses are applied.
Section 14 – Transport information
- UN number: UN 1263
- UN proper shipping name: PAINT
- Transport hazard class: Class 3 (flammable liquid)
- Packing group: III
- Environmental hazards: not classified as environmentally hazardous for transport; not a marine pollutant according to IMDG.
- Labels: class 3 flammable liquid label required.
- Special precautions for users:
- Always transport in securely closed containers in an upright, secure position.
- Ensure that persons transporting the product know what to do in the event of an accident or spillage.
- On-site transport within the user’s premises: transport only in closed, upright containers; follow local safety procedures.
Section 8 – Personal protective measures
The following information is taken from the Safety Data Sheet for Seajet 117 Multipurpose Epoxy Primer Base (Part A).
General safety recommendations
- Read and follow all precautionary statements on the container.
- Provide adequate ventilation using local exhaust and general extraction.
- Avoid breathing vapours, spray mist and sanding dust.
- Avoid contact with skin and eyes; do not eat, drink or smoke in the application area.
Respiratory protection
- If exposure may exceed occupational limits, use a respirator conforming to EN 140 fitted with a combined particulate and vapour filter to EN 14387 with an assigned protection factor of at least 10 (e.g. A2P3).
- During spray application in spray booths where ventilation may be insufficient, operators should wear a compressed air fed respirator until solvent vapour and particulate concentrations are below exposure limits.
- During dry sanding, flame cutting or welding of the dry film, wet sanding is preferred; if not possible, use suitable respiratory protection.
Hand protection
- Wear chemical resistant gloves tested to EN 374.
- Recommended for spray application: nitrile gloves.
- For intense solvent contact (e.g. immersion): Viton gloves provide good protection.
- Polyethylene (PE) gloves (0.062 mm) are specified for high chemical resistance and can be used as under-gloves in difficult situations such as high exposure or unknown chemical composition.
- Glove breakthrough time must exceed the actual use time; replace gloves regularly and at first sign of damage.
- Barrier creams may help protect exposed skin areas but must never be applied after exposure has occurred.
Eye and face protection
- Use safety eyewear tested to EN 166 designed to protect against splashes of liquids.
Skin and body protection
- Wear antistatic protective clothing made of natural fibre or high temperature resistant synthetic fibre.
- Keep contaminated clothing away from ignition sources and wash before reuse.
Environmental protection
- Do not allow the product to enter drains or watercourses.
- Contain and collect spills with non-combustible absorbents (e.g. sand, earth, vermiculite, diatomaceous earth) and dispose of as hazardous waste according to local regulations.
*Contenido generado por IA
