What is Interfill 830 Fast Part B and why choose it?
INTERFILL 830 FAST PART B is the dedicated fast-curing converter/curing agent (YAA869) for the Interfill 830 Fast Cure epoxy profiling filler system from International Náutica. Used in a 1:1 mix ratio by volume with Interfill 830 Fast Cure Part A (YAA867), it delivers rapid through-cure even at low temperatures, allowing thick applications of fairing filler on steel, aluminium and composite hulls without sagging or slumping.
When correctly mixed with Part A, the system produces a low-density, high-strength, waterproof epoxy filler that can be applied up to 2 cm (20,000 microns) in a single coat and sanded quickly. This makes Interfill 830 Fast Part B ideal for professional boatyards and applicators who need to fair large hull areas efficiently or carry out fast turnaround repair work.
Main features of INTERFILL 830 FAST PART B
- Fast-curing epoxy hardener – enables the Interfill 830 Fast Cure system to cure quickly, even at low ambient temperatures (down to 10°C).
- Designed for thick applications – in combination with Part A, allows fairing layers up to 2 cm in a single pass without sagging or slumping at 23°C.
- Low-density system – helps minimise overall weight while still achieving high build and fairing capability.
- High strength and impact resistance – contributes to a durable epoxy filler suitable for demanding marine environments.
- Easy to sand – once cured, the system sands to a very smooth surface for high-quality hull fairing.
- Waterproof – suitable for use above and below the waterline when overcoated with compatible epoxy primers and systems.
- Compatible with multiple primers and fillers – cured Interfill 830 Fast Cure can be overcoated with Interfill 833, Interfill 835, Interprime 820, Interprime 850, Interprime 880 or osmosis-protection systems such as Gelshield and Gelshield 200.
Technical specifications
- Product type: Epoxy curing agent / converter for Interfill 830 Fast Cure
- System: Two-component epoxy filler (used with Interfill 830 Fast Cure Part A YAA867)
- Mix ratio with Part A: 1:1 by volume (as supplied); 1.17:1 by weight (YAA867:YAA869)
- Recommended maximum wet film thickness (complete system): 20,000 microns (2 cm) per coat by trowel or batten
- Typical dry film thickness per coat (complete system): 20,000 microns
- Theoretical coverage (complete system): 0.2 m²/L per coat at 5,000 microns WFT
- Typical shelf life: 2 years (in unopened containers, between 5°C and 35°C, away from direct sunlight)
- Physical state: Paste
- Density (Part B reference curing agent): approximately 0.697 g/cm³
- Flash point: 101°C (closed cup)
- Colour: Consultar ficha técnica del fabricante.
- VOC value (Part B): Consultar ficha técnica del fabricante.
- Packaging sizes: 5 L and 20 L units (system sizes referenced for Interfill 830 Fast Cure)
Applications and use cases
Typical substrates
- Steel hulls (above and below the waterline)
- Aluminium hulls
- GRP / composite hulls
- Stable bare wood constructions (only when correctly primed with Interprime 820)
Typical areas of use
- Hull fairing on new builds – profiling and smoothing large steel, aluminium or composite hulls in shipyards and professional boatyards.
- Refit and repair fairing – restoring damaged or uneven underwater areas where quick curing and rapid overcoating are required.
- Low-temperature application – projects carried out in cooler climates or seasons where a standard-curing system would be too slow.
- Osmosis treatment schemes (GRP) – as part of a multi-step system, where cured Interfill 830 Fast Cure can be overcoated with Gelshield or Gelshield 200 according to the specified scheme.
Key application notes (system with Part A)
- All substrates must be clean, dry and free from contaminants.
- Previously painted surfaces in good condition should be washed with Super Cleaner, rinsed with fresh water, allowed to dry and abraded with 80–180 grit paper.
- On steel and aluminium, prime with Intergard 269 or Interprime 820 before applying the filler system.
- On stable bare wood, prime with Interprime 820.
- On GRP, degrease with solvent, Super Cleaner or suitable detergent, sand with 180–220 grit, clean and dry, then prime with the specified International primer.
- On bare GRP/composites, sand with 80–180 grit paper; if left more than 24 hours, epoxy primers and fillers must be sanded again with 80–180 grit to ensure good adhesion.
- After mixing Part A and INTERFILL 830 FAST PART B to a uniform colour, apply firmly by trowel or batten, then sand smooth with 80–180 grit once hardened.
- Do not apply more than 2 cm thickness in a single application.
- Do not thin the product and do not wipe cured filler with solvent; use GTA220 only for equipment cleaning.
- Standard- and fast-cure systems must not be wet-mixed together; they are only compatible once fully cured.
FAQ – INTERFILL 830 FAST PART B
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What is INTERFILL 830 FAST PART B used for?
It is the fast-curing converter/curing agent for the Interfill 830 Fast Cure epoxy profiling filler system, used to fair and profile hulls above and below the waterline.
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What is the correct mixing ratio with Part A?
The system is mixed 1:1 by volume as supplied. By weight, the typical ratio is 1.17:1 (YAA867: YAA869).
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How thick can I apply the filler in one coat when using Fast Part B?
When mixed with Part A, the Interfill 830 Fast Cure system can be applied up to 2 cm (20,000 microns) in a single coat by trowel or batten.
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At what temperatures can I use the product?
Product, ambient and substrate temperatures should be between 10°C and 35°C. Do not use below 10°C.
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How long can I wait before overcoating?
At 23°C, the sandable time is about 6 hours and the system can be overcoated from 6 hours onwards with products such as Interfill 833, Interfill 835, Interprime 820, Interprime 880 or Interprotect. Once the sandable time has been exceeded, always sand before overcoating.
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Can I mix standard Interfill 830 curing agent with Fast Part B?
No. Standard and fast cure systems must not be wet-mixed to obtain intermediate cure times or to use up leftover filler. They are only compatible once the films are fully cured.
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Which substrates are not recommended?
Do not use the system on traditional wood constructions where the timber can significantly expand and contract with moisture changes.
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How should I clean tools after use?
Use GTA220 for equipment cleaning. Do not use solvent on cured filler surfaces.
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Is INTERFILL 830 FAST PART B suitable for consumers?
The documentation specifies that the system is reserved for professional use. Appropriate training, equipment and safety procedures are required.
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What primers can I apply after fairing with Interfill 830 Fast Cure?
Cured and sanded filler can be overcoated with Interfill 833, Interfill 835, Interprime 820, Interprime 850, Interprime 880, Interprotect, Interprotect Professional and, within osmosis schemes, Gelshield or Gelshield 200.
Section 14 – Transport information
The following information refers to the curing agent used in the Interfill 830 system:
- ADR/RID: Non hazardous.
- IMDG: Non hazardous; not classified as a marine pollutant.
- ICAO/IATA: Non hazardous.
- General advice: During transport and storage, keep INTERFILL 830 FAST PART B in securely closed original containers. Prevent containers from tipping or leaking and avoid exposure to extremes of temperature.
Section 8 – Individual protection measures
The curing agent for Interfill 830 can be harmful by inhalation and ingestion, and it irritates eyes and skin with a risk of sensitisation. Always follow the safety data sheet and use appropriate personal protection:
- General hygiene: Prohibit eating, drinking and smoking in application areas. Wash hands, forearms and face thoroughly after handling and before breaks. Remove contaminated clothing and wash before reuse.
- Eye and face protection: Wear approved chemical splash goggles to protect against liquid splashes.
- Hand protection: Use chemical-resistant gloves. For the curing agent, nitrile gloves are specified during mixing and application. For extended or repeated contact, gloves with high breakthrough time (for example, multilayer laminated or nitrile/Viton type) should be used, following the glove manufacturer’s recommendations.
- Skin and body protection: Wear protective clothing covering arms, legs and body. Avoid any exposed skin. Barrier creams can assist but must not replace gloves and clothing.
- Respiratory protection: When spraying or where solvent and amine vapours may be present, use a respirator with a combined organic vapour and particulate filter (e.g. A2-P2 or ABEK1) or, in confined spaces, air-fed breathing apparatus. For roller or brush work in well-ventilated areas, an A2 organic vapour filter is indicated.
- Environmental protection: Prevent spills from entering drains, soil or watercourses. Collect and dispose of residues and contaminated materials through authorised waste channels.
Contenido generado por IA
