Hempel’s Sealer 05990

1. Product Characteristics

Recommended use
For saturation of well cleaned concrete surfaces before application of pigmented paints.
Must be applied in such an amount that the surface is just saturated. The surface should not appear “glossy” in any way.
Also suitable for sealing of thermally sprayed metallic coatings.

Service temperature:

• Maximum, dry exposure only: 140°C [284°F].

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2. Product Safety

Flash point: 25°C [77°F]

VOC content mixed product

Legislation	Value	5% thinning, by volume	Limit value, phase II (2010)ª
EU	606 g/L [5.06 lb/US gal]	618 g/L [5.16 lb/US gal]	750 g/L [6.26 lb/US gal]
US (coatings)	606 g/L [5.06 lb/US gal]	–	–
US (regulatory)	606 g/L [5.06 lb/US gal]	–	–
China	606 g/L [5.06 lb/US gal]	–	–

According to specific legislation, see details in the Explanatory Notes available at Hempel website, hempel.com or at your local Hempel website. ªEU Directive 2004/42/CE.

Handling
Handle with care. Before and during use, observe safety labels on packaging and paint containers and follow all local and national safety regulations. Always consult Hempel’s Safety Data Sheet for this product along with the Product Data Sheet.

For professional use only.

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3. Product Data

• Product code: 05990
• Product components: Base 05999, Curing Agent 95040
• Standard shade / code: Transparent 00000 *
• Gloss: Flat
• Volume solids: 29 ± 2%
• Specific gravity: 0.9 kg/L [8 lb/US gal]
• Reference dry film thickness: 30 micron [1.2 mils]

• Epoxy coatings may discolour and chalk when exposed to UV light. This does not affect the performance of the coating.

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4. Surface Preparation

Cleanliness

• Remove oil, grease and other contaminants by suitable detergent cleaning.
• Remove salts, detergents and other contaminants by high pressure fresh water cleaning.
• Concrete must cure completely; for 28 days minimum.
• Moisture content in the surface must be below 4%.
• A uniform anchoring profile should be achieved by suitable surface preparation method(s).

New build:

• Remove laitance and efflorescence by water jetting, abrading or blasting.
• Concrete: According to Hempel’s Specification.
• Remove dust, blast media and loose materials.

Maintenance and Repair

• Concrete: According to Hempel’s Specification.
• Remove dust, blast media and loose materials.

Consult Hempel’s separate Surface Preparation Guidelines for more details.

 

5. Application

Mixing ratio
Base 05999 : Curing Agent 95040
(4 : 1 by volume)
Stir well before use. Consult Hempel regarding thinning.

Thinner
Hempel’s Thinner 08450

Cleaner
Hempel’s Tool Cleaner 99610

Application method

Tool	Thinning max vol.	Application parameters
Airless spray	5%	Nozzle pressure: 100 bar [1500 psi], Nozzle orifice: 0.017–0.021″
Brush	5%	Not Applicable.

Spray data are indicative and subject to adjustment. Pressure is for a material temperature of 20°C [68°F].

Film thickness

Specification range	Dry film thickness	Wet film thickness	Theoretical spreading rate
Low / High / Recommended	30 micron [1.2 mils]	105 micron [4.2 mils]	10 m²/L [407 sq ft/US gal]

Spreading rate will depend on surface roughness, porosity of the substrate and application method.

Application conditions

• Surface temperature must be above 10°C [50°F] during application and curing.
• To avoid condensation, apply on a clean and dry surface with a temperature that is at least 3°C [5°F] above the dew point.
• Temperature of product must be above 15°C [59°F] during application.
• Relative Humidity: must be above 30% during curing.

Application remarks

• The surface must not appear glossy after application, the coating shall only seal the surface. Any surplus top layer must be removed prior to application of subsequent coat.

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6. Drying and Overcoating

Product compatibility

• Previous coat: None.
• Subsequent coat: None or according to Hempel’s specification.

Drying time

Surface temperature	Touch dry	Hard dry
20°C [68°F]	4 hours	4 hours

Determined for dry film thickness 30 micron [1.2 mils] at standard conditions. See Hempel’s Explanatory Notes for details.

Drying conditions

• Maintain sufficient ventilation during application, drying and curing.

Overcoating details

• If the maximum overcoating interval is exceeded, roughening of the surface is necessary to ensure intercoat adhesion.
• The surface must be clean before overcoating.

Other remarks

• Epoxy coats have an inherent tendency of chalking in outdoor exposure. This does not affect performance.
• Hempel’s Specification supersedes any recommendations given in the Product Data Sheets.

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7. Storage

Shelf life

Ambient temperature	Base	Curing Agent
25°C [77°F]	36 months	36 months

Shelf life from date of production, in original, unopened containers. Thereafter, re-inspect quality. Storage at elevated temperatures may reduce shelf life. Consult Hempel.

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8. Carbon Footprint

Dry film thickness	GWP (Global Warming Potential)
1 µm	18.1 g CO₂e/m²
1 mil	0.094 lb CO₂e/ft²

Based on the standard shade in this PDS. Includes raw materials, transport, Hempel manufacturing, and VOC emissions during and after application.

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9. Reference

• Product Data Sheet – Sealer 05990
  Issued by Hempel A/S – October 2024
  Document Version: 4/4
  Source: https://www.hempel.com

• Technical Guidelines and Explanatory Notes
  Last accessed: 28 May 2025
  Reference link: https://www.hempel.com/service-and-support/technical-guidelines

Note: Always consult the latest version of the Product Data Sheet and associated documents directly from Hempel’s official website to ensure accuracy and compliance with the most current recommendations.