What is Interprime 820 Converter and why choose it?
Interprime 820 Converter (YPA824) is the curing component of Interprime 820, a high performance 2-component epoxy primer from International Náutica. When mixed 3:1 by volume with the appropriate Interprime 820 base (white YPA828 or grey YPA829), it creates a durable, easy-to-sand epoxy coating suitable for a wide variety of marine substrates above and below the waterline. The system delivers excellent anticorrosive protection and is widely used in professional boatbuilding and repair projects.
Main features
- Part B converter for Interprime 820 high performance epoxy primer.
- Provides excellent anticorrosive protection when mixed with the base component.
- Easy sanding for fast fairing and high quality finishes.
- Suitable for use over steel, aluminium, stainless steel, GRP/gelcoat, epoxy fillers/primers and prepared hardwoods (as part of the complete system).
- Usable above and below the waterline.
- Designed for professional and industrial applications, interior and exterior.
Technical characteristics
- Product type: 2-component epoxy primer system (this item is the converter/curing agent, Part B).
- Compatible bases: Interprime 820 base YPA828 (white), YPA829 (grey, EU only).
- Mix ratio: 3:1 by volume (base : converter).
- Typical shelf life: 2 years.
- Finish (mixed system): Satin.
- Specific gravity (mixed system): 1.54.
- Volume solids (mixed system): 49%.
- VOC as supplied (mixed product): 448 g/L.
- Pack sizes: 5 L and 20 L (base and converter volumes configured to give 5 L or 20 L mixed).
- Recommended DFT per coat: 125 microns dry.
- Recommended WFT per coat: 255–266 microns wet (160 microns wet when applied thinned direct to metal as specified).
- Theoretical coverage: 3.64 m²/L per coat.
- Practical coverage (spray): 2.8 m²/L per coat.
- Touch dry (mixed coating): approx. 12 h at 10°C, 9 h at 15°C, 6 h at 25°C, 5 h at 35°C.
- Pot life after mixing: approx. 12 h at 10°C, 6 h at 15°C, 4 h at 25°C, 3 h at 35°C.
- Application methods: Airless spray, air atomised (conventional) spray, roller, brush (touch-ups).
- Minimum/maximum application temperatures: Ambient, product and substrate between 10°C and 35°C.
Applications and use cases
Typical substrates
- Steel and stainless steel hulls, appendages and fittings.
- Aluminium hulls, superstructures and components.
- GRP/gelcoat surfaces on yachts and powerboats.
- Epoxy fillers (e.g. Interfill 830/833) and epoxy primers in good condition.
- Prepared bare hardwoods (as part of the full Interprime 820 system).
Typical marine uses
- Newbuild and repair work in professional yards and dry docks.
- Corrosion resistant priming for hulls above and below the waterline.
- Tie-coat and sealer over high performance epoxy fillers prior to high-build surfacers or finish coats.
- Part of multi-coat systems with Interprotect, Interprime 880, Epoxy Tiecoat, high build surfacers and undercoats.
Surface preparation (summary)
Interprime 820 Converter must always be used as part of the correctly prepared Interprime 820 system. Key preparation steps for the mixed primer include:
- Stainless steel / steel / aluminium / lead: Thorough degreasing with suitable thinner/cleaner using the two-cloth method before any mechanical preparation.
- Steel: Blast to near white metal (AS1627.4 Class 2.5) or grind with 24–36 grit abrasives to clean, bright metal with 50–75 microns anchor profile.
- Aluminium: Low pressure grit-blast with aluminium oxide or copper-free equivalent, or power-disc sand with 24–36 grit to 50–75 microns profile. Power wire brushing is not permitted.
- Stainless steel: Light grit-blast to 50 microns profile before applying a thinned tie-coat of Interprime 820.
- GRP/gelcoat: Wash with Super Cleaner or Thinner No. 7 (AP), rinse with fresh water, dry and sand with 180 grit. Remove all waxes, uncured resins and sanding debris.
- Bare wood: Sand with 80–280 grit and remove oil from oily species (e.g. teak) with recommended thinners. First primer coat may be thinned 15% with suitable thinner.
- Epoxy primers: Sweep blast or abrade with 120–180 grit.
- Epoxy fillers: Sand with 60–120 grit; do not solvent wipe cured epoxy fillers.
Application guidelines (mixed system)
- Mixing: Combine Interprime 820 base and Interprime 820 Converter (YPA824) thoroughly at 3:1 by volume.
- Thinning (general): YTA910, YTA920 or YTA061 Epoxy Thinner No.7 (AP only). Choice depends on temperature and application method.
- Thinning direct-to-metal: Thin Interprime 820 by 15% with YTA061 (AP only), YTA910 or YTA920 and apply 160 microns wet film thickness.
- Airless spray: Approx. 175 bar; tip size 1560–2180.
- Air atomised spray: Thin 15–20% with YTA910 or YTA920, or up to 20% with YTA061. Pressure approx. <1 bar (pressure pot) / 3–4 bar (atomising); tip size 1.8 mm.
- Brush: Recommended mainly for touch-ups.
- Number of coats: As specified in the relevant coating system specification, observing the stated overcoating intervals.
Overcoating times (mixed coating)
Minimum and maximum overcoating intervals depend on substrate temperature and subsequent product. Examples (25°C):
- Interprime 820 over Interprime 820: Min 8 h, Max 6 months.
- Interfill 830 / 833: Min 24 h, Max 3 months.
- Interprotect / Interprotect Professional / Interprime 880 / Epoxy Tiecoat: Min 8 h, Max 6 months.
- Perfection Pro Undercoat: Min 12 h, Max 3 days.
FAQ
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What exactly is Interprime 820 Converter?
It is Part B (curing agent YPA824) of the Interprime 820 2-component epoxy primer system. Mixed 3:1 with the base component, it initiates curing and gives the coating its final performance.
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On which substrates can the mixed Interprime 820 system be used?
On suitably prepared steel, aluminium, stainless steel, fiberglass/gelcoat, epoxy primers and fillers, and properly prepared bare hardwoods, both above and below the waterline.
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What are the minimum and maximum temperatures for application?
Ambient, product and substrate temperatures must all be between 10°C and 35°C during application and curing.
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How long can I use the product after mixing base and converter?
Pot life is approximately 12 hours at 10°C, 6 hours at 15°C, 4 hours at 25°C and 3 hours at 35°C.
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Is it suitable for below-waterline areas?
Yes. The Interprime 820 system is suitable for use on a variety of substrates above and below the waterline when used as part of an appropriate coating scheme.
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Can I apply Interprime 820 by roller?
Yes, application methods include airless spray, air atomised spray, roller and brush (for touch-ups). Coverage figures are based mainly on spray.
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Do I need to thin the product?
Thinning is application- and temperature-dependent. For conventional spray a 15–20% addition of YTA910, YTA920 or YTA061 is typical. For direct-to-metal applications a 15% thinning is specified.
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Is this product intended for DIY users?
The safety data sheet specifies “For professional use only”, so it is intended for professional and industrial applicators.
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How should I dispose of leftover mixed material?
Leftover Interprime 820 must not be poured into drains or watercourses and cannot go through normal municipal waste without permit. Allow paints to harden where possible and arrange disposal with the competent authorities or a licensed waste contractor.
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What is the typical shelf life of the Interprime 820 components?
Under correct storage conditions, typical shelf life is 2 years.
Section 14 – Transport information
- UN number: UN1263.
- UN proper shipping name: PAINT.
- Transport hazard class: Class 3 (flammable liquid).
- Packing group: III.
- Environmental hazards: Not classified as marine pollutant under the provided data.
- Applicable modes: ADR/RID (road/rail), IMDG (sea), IATA (air) – all as PAINT, Class 3, PG III.
- Tunnel restriction code (ADR/RID): (D/E).
- IMDG emergency schedules: F-E, S-E.
- Special precautions for user: Within user premises, always transport in securely closed, upright containers. Ensure personnel know the procedures in case of accident or spillage.
- Bulk transport according to IMO instruments: Not applicable.
- Storage during transport: Keep containers closed and protected from extremes of temperature and direct sunlight; recommended storage temperature between 5°C and 35°C.
Section 8 – Personal protective measures
The converter and the mixed Interprime 820 system are classified as flammable and can cause skin and eye irritation, serious eye damage, respiratory irritation, drowsiness or dizziness, and organ damage from prolonged or repeated exposure. Appropriate personal protection is essential, especially for professional applicators.
Engineering controls
- Use only with adequate ventilation.
- Employ local exhaust or process enclosure to keep airborne levels below regulatory exposure limits and below lower explosion limits.
- Use explosion-proof ventilation and electrical equipment.
Personal protective equipment (PPE)
- Eye/face protection: Chemical splash goggles and/or face shield complying with an approved standard. A full-face respirator may be required if there is a risk of inhalation plus splashes.
- Hand protection: Chemical-resistant, impervious gloves. For prolonged or frequent contact, gloves with protection class 6 (breakthrough > 480 min, EN374) such as Viton or nitrile with thickness ≥ 0.38 mm are recommended. For brief contact, nitrile gloves with thickness ≥ 0.12 mm (protection class ≥ 2) are recommended.
- Skin and body: Suitable protective clothing selected according to the task, ideally anti-static overalls, boots and gloves when there is a risk of ignition from static electricity (see EN 1149).
- Respiratory protection: Where ventilation is inadequate or exposure limits may be exceeded, wear a respirator conforming to EN140 with type A/P2 filter or better, within a full respiratory protection program.
- Other skin protection: Appropriate chemical-resistant footwear and any additional skin protection as required by the specific job.
Hygiene and environmental precautions
- Wash hands, forearms and face thoroughly after handling and before eating, drinking or smoking.
- Remove contaminated clothing and protective equipment before entering eating areas and wash before reuse.
- Ensure eyewash stations and safety showers are available near the work area.
- Prevent emissions and spills from entering drains or watercourses; follow local environmental regulations.
*Contenido generado por IA
