FINE FILLER 303

What is ALEXSEAL FINE FILLER 303 and why choose it?

ALEXSEAL Fine Filler 303 is a solvent-free, epoxy-based fairing filler designed for professional use on marine and industrial surfaces. It cures without shrinking into a water-resistant, solid coating and is formulated to be applied between ALEXSEAL fairing compounds and ALEXSEAL primers (Super Build 302 and Finish Primer 442). Thanks to its fast drying and excellent sanding characteristics, it delivers smooth, high-build surfaces with superior mechanical resistance.

Main features

• Epoxy, solvent-free formula – cures without shrinking and forms a dense, water-resistant coating.
• High mechanical resistance – the cured film offers superior mechanical strength.
• Excellent sanding properties – easy to block sand with P100–P150 grit for a smooth, even finish.
• Above and below waterline use – suitable for correctly prepared substrates both above and below the waterline (must be sealed before topcoating when used below waterline).
• High film build and 100% volume solids – designed as a surfacer/filler to even out imperfections efficiently.
• Controlled mixing – base and converter are different colours, making homogeneous mixing easy to verify.
• Low VOC – volatile organic compound content is < 0.01% (< 0.2 g/L).
• Professional-only product – intended for industrial and yacht coating applications by trained applicators.

Technical characteristics

Composition and colour

• Chemistry: epoxy-based filler (mixture of synthetic resins and pigments).
• Solvent content: solvent-free; volume solids 100% (mixed material).
• Mixture colour: Sand.
• Base material: Light Gray.
• Converter: Beige.

Curing and performance

• Recommended application environment: 15–30 °C (60–85 °F), 40–80% RH.
• Pot life (approx.):
  • 15 °C (60 °F): 2 hours
  • 20 °C (68 °F): 90 minutes
  • 25 °C (77 °F): 45 minutes
  • 30 °C (85 °F): 30 minutes
• Dry to sand:
  • 15 °C: 48 hours
  • 20 °C: 24 hours
  • 25 °C: 18 hours
  • 30 °C: 12 hours
• Tape dry: identical to “dry to sand” values.
• Fully cured:
  • 15 °C: 9 days
  • 20 °C: 7 days
  • 25 °C: 5 days
  • 30 °C: 3½ days
• Minimum application condition: at least 3 °C (5.4 °F) above dew point.
• Ideal drying temperature: 25 °C (77 °F).

Chemical and physical data

• Physical state: liquid before curing.
• Density (mixed): approx. 1.81 g/cm³.
• Boiling point: approx. 100 °C.
• Flash point: 101 °C (ISO 13736).
• Water solubility: insoluble; immiscible with water.
• Viscosity, kinematic: > 21 mm²/s.
• Flow time: > 150 s at 20 °C (DIN 53211, 4 mm cup); > 100 s (ISO 2431, 6 mm cup).
• VOC content: < 0.01% (< 0.2 g/L).

Coverage

• Volume solids (mixed material): 100%.
• Theoretical and practical coverage: 20 m²/L (76 m²/gal; 818 ft²/gal) at 50 µm (2 mils) dry film thickness.
• Actual coverage depends on filling depth and size/condition of the surface.

Packaging and trade names

• P3033 ALEXSEAL Fine Filler 303 (base): available as 1 gal or 2 gal units depending on data sheet version.
• C3034 ALEXSEAL Fine Filler 303 Converter: available as ½ gal or 1 gal units depending on data sheet version.

Mixing ratio

• By volume: 2 parts P3033 ALEXSEAL Fine Filler 303 (base) to 1 part C3034 ALEXSEAL Fine Filler 303 Converter.
• Thinning: must not be reduced; do not add solvent.

Applications and use cases

Intended uses

• Industrial serial painting: suitable for professional industrial coating lines.
• Marine fairing and surfacing: used as an intermediate filler between ALEXSEAL Fairing Compound 202 and ALEXSEAL Super Build 302 and/or ALEXSEAL Finish Primer 442.
• Above and below waterline surfaces: for evening out imperfections on properly prepared substrates above and below the waterline (below waterline applications must be sealed with 302 and/or 442 before topcoating).

Compatible substrates

• ALEXSEAL primers and fillers.
• Gel coat and raw resin lay-up.
• Fiberglass laminates (properly ground or sandblasted).

Surface preparation

• Substrates must be clean, dry and free from dust, grease, oil and other contamination.
• Sand ALEXSEAL primers/fillers, gel coat or raw resin with P80–P150 grit.
• Fiberglass resin: grind with P36–P60 grit and/or sandblast. The surface and the bottom of any fiberglass profile should be dull and uniformly abraded without shiny spots.
• Before final topcoating, seal ALEXSEAL Fine Filler 303 with ALEXSEAL Super Build 302 and ALEXSEAL Finish Primer 442.

Application method

• Application tools: trowels, spatulas, straight-edge materials.
• Mix base and converter until the colour is completely homogeneous. Different component colours help visually control mixing quality.
• Use slow-turning dough mixers or mix manually; do not use drill mixers. Avoid entrapping air bubbles.
• Apply in thin layers by spatula or trowel, working up to the desired thickness before pulling off the excess with a straight edge. This helps prevent air pockets in the applied product.
• Clean application equipment with R4042 ALEXSEAL Epoxy Primer Reducer.

Sanding and recoating

• Block sand ALEXSEAL Fine Filler 303 with P100–P150 grit.
• Finishing with P150 grit or finer helps avoid sand-scratch print-through in the final coating system.
• Recoating Fine Filler 303 over itself should follow minimum “dry to sand” times. Scratch sand with P80–P120 grit to ensure intercoat adhesion.
• Overcoat with ALEXSEAL Super Build 302 and/or ALEXSEAL Finish Primer 442 after minimum drying times and block sanding with P100–P150 grit.

FAQ

1. Can ALEXSEAL Fine Filler 303 be used below the waterline?

   Yes, it can be used on properly prepared surfaces below the waterline, but it must be sealed with ALEXSEAL Super Build 302 and/or ALEXSEAL Finish Primer 442 before the final topcoat.

2. Do I need to thin ALEXSEAL Fine Filler 303?

   No. The product must not be reduced and should be used without solvent.

3. What is the correct mixing ratio?

   Mix 2 parts by volume of P3033 ALEXSEAL Fine Filler 303 (base) with 1 part by volume of C3034 ALEXSEAL Fine Filler 303 Converter.

4. How long can I work with the mixed material?

   Pot life is approximately 2 hours at 15 °C, 90 minutes at 20 °C, 45 minutes at 25 °C and 30 minutes at 30 °C.

5. When can I sand the filler?

   At 20 °C, the product is dry to sand after about 24 hours. At 25 °C this is reduced to approximately 18 hours, and at 30 °C to about 12 hours.

6. What grit should I use for sanding?

   Use P100–P150 grit for block sanding. For intercoat adhesion between layers of Fine Filler 303, scratch sand with P80–P120 grit.

7. Which substrates are suitable?

   Suitable substrates include ALEXSEAL primers and fillers, gel coat, raw resin lay-up and properly ground or sandblasted fiberglass laminates.

8. What is the coverage rate?

   The theoretical and practical coverage is 20 m²/L (76 m²/gal; 818 ft²/gal) at 50 µm dry film thickness, depending on the depth of filling and surface condition.

9. Is the product flammable?

   Under normal conditions it is not combustible; however, the flash point of the liquid is 101 °C.

10. Is ALEXSEAL Fine Filler 303 suitable for DIY users?

    No. The product is specified for professional use only.

Section 14: Transport information

• UN number: UN 3082.
• UN proper shipping name (ADR/IMDG/IATA): ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (4,4'-Isopropylidenediphenol, oligomeric reaction products with 1-chloro-2,3-epoxypropane, formaldehyde, oligomeric reaction products with 1-chloro-2,3-epoxypropane and phenol).
• Transport hazard class: Class 9 (Miscellaneous dangerous substances and articles).
• Packing group: III.
• ADR classification code: M6; Hazard Identification Number 90; Tunnel restriction code (-).
• IMDG: Class 9, Packing group III, EmS code F-A, S-F.
• IATA: Class 9, Packing group III, Packing instruction 964 (cargo and passenger); LQ packing instruction Y964.
• Environmental hazards: classified as environmentally hazardous for ADR and IATA; marine pollutant under IMDG.
• Bulk transport: not applicable for product as supplied.

Section 8: Personal protective measures

Exposure controls

• Engineering controls: provide good ventilation through local exhaust and general extraction in the work area.

Individual protection equipment (PPE)

• Eye/face protection: wear safety goggles suitable for protection against liquid splashes.
• Hand protection:
  • Use chemical-resistant protective gloves complying with EN 374.
  • Recommended materials for short-term contact (splash protection): nitrile rubber or neoprene.
  • Minimum glove thickness: > 0.4 mm.
  • Minimum breakthrough time: > 480 minutes.
  • Replace gloves immediately if damaged or at first signs of wear.
• Skin and body protection: wear work clothing as commonly used in the chemical industry. Wash skin after contact with the product.
• Respiratory protection: normally not required, but avoid breathing vapours, mists or dust from sanding.

General safety and hygiene measures

• Do not eat, drink or smoke while handling the product.
• Avoid contact with skin, eyes and clothing.
• Avoid inhalation of vapours, sanding dust or spray mist arising from application.
• Follow usual precautions when handling chemicals.

*Contenido generado por IA