Altro Seal™


Solvent-based polyurethane resin seal with a flat-silk finish, suitable for light duty areas where colour stability and chemical resistance are required. It is readily cleaned and maintained, providing a hygienic surface finish.

Resistant to a wide range of chemicals and UV-light, and can also be used as a final seal coat to give extra chemical resistance to epoxy resin systems. It has approximately 90 microns per coat and is available in coloured and clear.

Variations include:

  • Standard: For areas where there is a low risk of slipping.
  • Slip resistant: Includes a micaceous mineral that lightly textures the surface.
  • Vertical: A chemically and UV resistant coating for improved colour stability in light colours, although additional coats may be required over darker substrates.
  • Altro Seal water-based matt: A twin-pack, water-borne polyurethane clear resin seal with a matt finish. This coating has been developed to provide a cosmetic seal coat to epoxy resin systems where a matt finish is preferable. Approximately 50 microns per coat.


Bond Strength to BS EN 4264:B3.5.


- Altro Seal water-based matt:

  • The surface should be dry as well as being free from any contamination that may affect the adhesion of Altro Seal water-based matt. Resin surfaces that have been left for more than 24 hours prior to application will need suitable preparation in order to promote adhesion. When applying to new or existing Altro Flow the surface will require preparation with Altro Siliclean.
  • Substrates should achieve 26 N/mm² compressive strength (BS EN 12504-2) and surface tensile strength 1.5N/mm² (BS EN 13892-8).
  • Substrates must include an effective damp proof membrane and contain residual moisture not greater than 5% by weight (75% R.H.) to BS 8203:2017.
  • Altro Seal substrates should be dry, structurally sound and free from contamination, friable materials or laitance which may affect either the adhesion or penetration of the resin system. All residues of old paint coatings and dust must be removed.

General information

Uniclass 2015

Ss_30_42_54_75 Resin flooring systemsPrimary


M12/10 Resin flooring

M12/110 Resin flooring

Specification data - Resin flooring systems

Product Reference

Altro Seal™ slip-resistant

Altro Seal™ standard

Altro Seal™ vertical

Altro Seal™ water-based matt


Altro Seal gloss single pack

Resin coating


Number of coats




90 micrometres/ coat


Insert requirement from 'Options' below.

Other requirements

Altro Line marking system

Altro Expand flexible joint system

Altro Expand vertical

Standard product features


- Altro Seal standard (coloured), and Altro Seal vertical (coloured):

  • First coat: 30 m² per 5 kg.
  • Second coat: 40 m² per 5 kg.

- Altro Seal standard (clear), and Altro Seal vertical (clear):

  • First coat: 25 m² per 5 kg.
  • Second coat: 40 m² per 5 kg.

- Altro Seal slip-resistant (coloured):

  • First coat: 30 m² per 5 kg.
  • Second coat: 35 m² per 5 kg.

- Altro Seal water-based matt:

Single coat: 100 m² per 5 kg.

Product Options


Altro Seal gloss single pack should be applied to dense power floated concrete.


  • Burnt Chocolate, Clear, Cloud, Cyprus, Dawn, Doe, Flint, Gunmetal, Indigo, Jade, Magenta, Magic, Norfolk, Patina, Portland Grey, Ramone, Ranch, Ruby, Sark, Spruce, Toast, Topaz, Tropic, Wedgewood, Wine Red, Winter Grey.
  • Safety Yellow, Safety Red, Black (for small demarcation areas only).

Other requirements:

- AltroLine:

Altro Line is a high build, single application line marking coating.

- Altro Expand and Altro Expand vertical:

A twin-pack, elastomeric epoxy resin jointing compound designed as a pourable filling for movement joints within the substrate, AltroExpand provides a degree of flexibility to accommodate compression, whilst offering support to the arris of the joint when subjected to heavy wheeled traffic. A knife-applied grade is available for vertical use.


Resin systems

Resin systems

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Altro Grip™

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Altro Mosaic™

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Altro Screed™

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Altro Tect™

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