SIKAPRIMER 290 DC

What Sika Primer-290 DC is and why choose it

Sika Primer-290 DC is a non-pigmented, solvent-based polyurethane primer designed to promote adhesion when bonding and sealing timber decking strips. It reacts with atmospheric moisture to form a thin, continuous layer that reliably links the substrate with Sikaflex sealants and adhesives. Specifically developed for marine and timber deck applications, it helps ensure durable joints and bonds on suitable woods and GRP (polyester-based) substrates.

Main features

• Dedicated timber decking primer for strips to be caulked with Sikaflex-290 DC or bonded with Sikaflex-298.
• Solvent-based polyurethane solution that forms a thin moisture-reactive layer for improved adhesion.
• Colourless to slightly yellow, non-pigmented appearance.
• Optimised for marine woods such as teak, mahogany and Oregon pine, as well as cork and polyester-based GRP.
• Single-application system: applied once in a thin but covering coat.
• Brush or spray application, with defined flash-off times before over-sealing or bonding.
• Quality and environmental management: manufactured under ISO 9001/14001 (according to technical sheet).

Technical specifications

• Chemical base: Solvent-based polyurethane solution
• Colour: Colourless, slightly yellow / transparent with yellowish tint
• Density (approx.): 1.0 kg/l (20 °C)
• Viscosity (approx.): 20–35 mPas (20 °C)
• Solid content: 34 % (approx.)
• Flash point: about -4 to -8 °C
• Application temperature: 5 – 40 °C
• Ideal application / surface temperature: 15 – 25 °C
• Application methods: Brush or spray (also felt, according to one technical sheet)
• Consumption: approx. 50 ml/m² depending on substrate porosity (100 – 200 ml/m² on some data)
• Flash-off / drying time before over-bonding:
  • ≥ 15 °C: minimum 60 minutes
  • < 15 °C: minimum 120 minutes
  • Maximum flash-off time: 24 hours
• Maximum drying time (one data sheet): up to 7 days
• Shelf life: 12 months (stored upright in unopened containers, dry, ≤ 25 °C)
• Physical state: Liquid
• Odour: Similar to esters
• Boiling point: approx. 77 °C
• Self-ignition temperature: > 400 °C
• Lower explosion limit: approx. 2 % vol.
• Upper explosion limit: approx. 12 % vol.
• Vapour pressure at 20 °C: approx. 60 hPa
• pH (20 °C): approx. 7
• VOC content (solvent): approx. 65.98 %
• Packaging sizes: 30 ml, 250 ml, 1000 ml cans (30 ml for single application only)

Applications and use cases

Recommended substrates

• Teak
• Mahogany
• Oregon pine
• Cork
• GRP based on unsaturated polyester (UP)

Typical uses

• Priming timber decking strips prior to caulking with Sikaflex-290 DC.
• Priming timber decking strips before bonding with Sikaflex-298.
• Improving adhesion on specified woods and polyester-based GRP in professional applications.

Application guidance (summary)

• Substrates must be clean, dry and free from grease, oil, dust and contaminants.
• Adhesion may be improved by pre-treatments such as scuffing and cleaning (and/or sanding and activation as stated in some sheets).
• Apply a thin but continuous coat using a clean, dry brush (or felt/spray where specified).
• Ensure complete coverage of the timber, avoiding excess material.
• Allow a minimum of 60 minutes flash-off (longer at lower temperatures) before applying Sikaflex sealant or adhesive.
• Apply in one direction and only once, ensuring the single application provides adequately dense coverage.
• Reseal the container tightly immediately after use, using the inner plastic liner where supplied.

FAQ

1. What is Sika Primer-290 DC used for?

   It is used as a solvent-based primer to improve adhesion when sealing or bonding timber decking strips, particularly before using Sikaflex-290 DC or Sikaflex-298 on suitable woods and GRP (polyester-based).

2. Which substrates are suitable?

   According to the technical data, it is formulated for teak, mahogany, Oregon pine, cork and GRP based on unsaturated polyester. For materials prone to stress cracking, manufacturer’s advice and tests on original substrates are required.

3. How many coats should be applied?

   It must be applied once only, in a thin but covering coat. Care should be taken that this single application provides adequately dense coverage.

4. How long should I wait before applying Sikaflex products?

   Primed surfaces should generally be left at least 60 minutes before sealing or bonding with Sikaflex products (longer at temperatures below 15 °C, with a maximum flash-off time of 24 hours).

5. Can Sika Primer-290 DC be sprayed?

   Yes, it can be applied by spray. For spray application and selection of suitable spray equipment, the documents state that you should contact the relevant technical or system engineering department of Sika Industry.

6. How should the product be stored and how long does it last?

   Store in sealed containers, upright, in a cool, dry place at or below 25 °C. Under these conditions the shelf life is 12 months.

7. What should I do with opened containers?

   Because it is moisture-reactive, the container must be tightly resealed with the inner plastic liner immediately after use. The safety data states that product should typically be disposed of about one month after opening if used frequently, or after two months if used infrequently. Cans of 30 ml are intended for single application only.

8. Can the primer be diluted or mixed with other products?

   No. The documentation explicitly states that Sika Primer-290 DC must never be diluted or mixed with any other substance.

9. Is UV protection required?

   If used on transparent or translucent substrates such as plastics, adequate UV protection is mandatory.

Section 14 – Transport information

• UN number: UN 1866
• Proper shipping name (ADR/RID): Resin solution
• Proper shipping name (IMO/IMDG, IATA/ICAO): Resin solution, flammable
• Transport hazard class: Class 3 (flammable liquid)
• Packing group: II
• Class code (ADR/RID): F1
• Label: 3
• Marine pollutant (IMDG): No

Section 8 – Personal protective measures

The following individual protection measures are extracted from the safety data information and apply to handling Sika Primer-290 DC under workplace conditions:

• General hygiene measures
  • Ensure adequate ventilation or exhaust in the working area.
  • Avoid contact with eyes and skin.
  • Apply protective skin cream as a preventive measure.
  • Remove contaminated or soaked clothing immediately.
  • Do not eat, drink or smoke while working with the product.
  • Wash hands before breaks and after finishing work.
• Respiratory protection
  • In case of insufficient ventilation, use respiratory protection.
  • The data sheet refers to a protective mask with a vapour filter type A, chosen according to the ambient contaminant concentration.
• Hand protection
  • Use butyl or nitrile rubber gloves.
• Eye protection
  • Wear protective goggles.
• Skin and body protection
  • Wear suitable work clothing.

*Contenido generado por IA