Hychem WE90 — Pigmented, High Solids, Water-Based Epoxy Coating

Prior to the application of HYCHEM WE90, the substrate must be thoroughly prepared and primed.

• The concrete substrate must be firm, clean and dry with a compressive strength of 25 MPa and a minimum surface tensile strength of 1.5 MPa.
• New concrete must be allowed to cure for a minimum of 28 days.
• Remove all surface laitance, contaminants, existing coatings, curing compounds and any weak or loose materials.
• Prepare the concrete surface by grinding, to provide the appropriate concrete surface profile (CSP) for optimum mechanical keying.
• The extent of surface preparation required is dependent upon, but not limited to, the thickness of the coating system to be applied. It is highly recommended that surface preparation is carried out in accordance with industry standards and publications such as NACE 02203 item No. 22420 or ICRI Technical Guideline No. 03732.

It is important to note that even when the application environment is warm, products which have been stored in cold or cooler conditions should be pre-conditioned, ideally to 20-25°C, to ease mixing and application and help avoid other potential issues such as amine bloom or blushing. Applying a cold product in a warm environment is not recommended.

• It is recommended to dilute with 2 litres of water for easier application.
• Do not mix resin, hardener and water at the same time.
• Resin and hardener must be mixed before the addition of any water.
• Mix with a mechanical stirrer at a speed of 500 rpm to avoid incorporating excessive air into the mix.
• Mix for 2 minutes, scrape down the sides of the mixing container and mix for another minute to ensure the mix is homogeneous.
• Add water 1 litre at a time and mix until uniform, ensuring all material is incorporated.

Apply the mixed product at approximately 6-8 m²/L per coat.

Temperature and the surrounding atmospheric conditions will play a part in the curing process of all resin products. Under conditions of low temperatures and high humidity the final cured surface finish can be adversely affected, potentially resulting in poor gloss retention, discoloration over time, poor overcoat ability and inter-coat adhesion. Quite often these conditions will result in the formation of a white film over the surface, often evident after contact with water. If this occurs, the existing coating will need to be abraded to completely remove the affected surface to ensure the adhesion of subsequent applications. In some cases, partial or complete re-priming may be necessary. Attention also needs to be paid to the substrate temperature, which should be at least 3-5 °C above the dew point during the curing phase. Industry standards recommend the accurate recording of environmental conditions such as substrate and air temperatures, humidity levels and dew point readings during both the application and curing processes. Full material warranties cannot be provided unless all the relevant data has been recorded accurately. If in doubt consult the HYCHEM technical department for advice.

Wear gloves, eye protection and overalls during mixing and application. Ensure there is adequate ventilation and avoid breathing the vapour.

12 months from date of manufacture when stored under shelter at 25°C and in the original un-opened container.

The packaging must be stored properly in original, unopened and undamaged sealed packaging, in dry conditions at temperatures between 5°C and 30°C.

HYCHEM WE90 is supplied pigmented in a wide colour range.

• Coatings and overlays containing water must not be applied directly to HYCHEM WE90 resin unless a sufficiently porous mortar has been installed or it has been fully broadcast with dry aggregate e.g. quartz or silica sand.
• Ensure consumption of material is uniform to achieve proper appearance, texture and consistent performance.
• Ensure the material is mixed and stirred properly. Incorrect mixing can lead to performance issues.
• If heating is required do not use gas, oil, paraffin or other fossil-fuel heaters. Use only electric-powered warm-air blower systems.
• At low temperatures and low humidities (< 40% relative humidity), curing and recoat times will be affected.