Design Citeria

The coating should be applied in two coats to achieve a total dry film thickness of not less than 180 microns. To achieve the correct protective properties, Vetotop AC440 system must be applied on to the substrate at the coverage rates recommended.

Application
In order to obtain the protective properties of the Vetotop AC440 , it is important that the correct rates of application and over-coating times are observed.
Application should not commence if the temperature of the substrate is below 5°C.
Any areas of glass should be masked. Plants, grass, joint sealants, asphalt and bitumen-painted areas should be protected during application.
Vetoprime AP443 should be applied in one or more coats until the recommended application rate of 0.4 liter per square meter has been achieved. This is best accomplished by using portable spray equipment. If in doubt about the condition of the substrate, Saveto Technical Center should be consulted.
Allow the primer to dry for a minimum of 8 hours (at 20°C), longer at lower temperatures. Under no circumstances should the primer be overcoated with Vetotop AC440 until the surface is properly dry.
Vetotop AC440 may be applied by the use of suitable brushes or rollers. Queries relating to spray application should be referred to Saveto Technical Department prior to the commencement of work.

All primed substrates should be treated with two coats of Vetotop AC440. The material should be stirred thoroughly before use. The first coat should be applied to all areas by the use of suitable brushes or rollers to achieve a uniform coating with a wet film thickness not less than 400 microns. This coat should be allowed to dry before continuing.
The second coat of Vetotop AC440 should be applied exactly as detailed above.
Under poor drying conditions at low temperatures it may be more practical to apply three thinner coats (270 microns wet film thickness each) of Vetotop AC440 to achieve better ‘through-drying’. This method will achieve the correct recommended dry film thickness.

Cleaning
Vetorep CR523 and Vetotop AC440 should be removed from tools and equipment with clean water immediately after use. Vetoprime AP443 a should be removed from tools and equipment using Vetonit Solvent XX400.

All surfaces should be dry and free from contamination such as oil, grease, loose particles, decayed matter, moss, algal growth, laitance, and all traces of mould release oils and curing compounds. This is best achieved by lightly grit blasting the surface. Where moss, algae or similar growths have occurred, treatment with a proprietary biocide should be carried out after the grit-blasting process.
Where application over existing sound coatings is required, trials should be conducted to ensure compatibility and retention of the bond between the underlying coating and the substrate.
It is essential to produce an unbroken coating of Vetotop AC440. To ensure this is achieved, surfaces containing blow- holes or similar areas of pitting should first be filled using Vetorep CR523, a cementitious fairing coat. Vetorep CR523 should be allowed to cure for approximately 48 hours dependent on ambient conditions before the application of Vetotop AC440.

• Vetotop AC440 is formulated for application to clean, sound concrete or masonry.
• Where application over existing sound coatings or paints is required, trials should be conducted to ensure compatibility and retention of the bond between the underlying coating and the substrate.
• When applied over existing coatings or paints, the performance characteristics of Vetotop AC440 may be impaired and its fire rating invalidated.
• Compatibility and soundness should be assessed on a trial area.
• Application Vetoprime AP433 should not commence if the temperature of the substrate is below 2°C.
• Application of Vetotop AC440 should not commence if the temperature of the substrate is below 5°C.
• Vetotop AC440 should not be applied where there is a likelihood of exposure to frost within 48 hours of application.
  Do not apply in windy conditions where early-age dust adhesion may occur, or where rain is likely within 2 hours at 20°C or 20 hours at 5°C (up to 80% RH).
• Do not be apply when the prevailing relative humidity exceeds 90%.
• Vetotop AC440 should not be considered for areas subjected to exposure to ponded water. In such cases use Vetotop AC442.
• The elastomeric properties and high tear strength of Vetotop AC440 make it unsuitable for use in areas subject to direct physical attack by vandals. Where appropriate, Vetotop AC442 should be considered.
• Vetotop AC440 should not be used on soffits subject to possible water ingress. In these cases use Vetotop AC442.
• For further information contact Saveto technical department.