FEATURES AND BENEFITS
 1) Crackless application.
 2) Mixes easily with potable water.
 3) High-ductility smoothing and leveling layer on concrete repaired.
 4) High bonding strength
 5) Impermeable to water and aggressive gases present in the atmosphere
 

USES
1) Smoothing and leveling layers on concrete, stone, brick and tuff surfaces.
2) For laying glass fiber mesh in “reinforced” structural strengthening systems on facing walls, ceilings and masonry elements.
3) Strengthening masonry facing walls, ceilings and general masonry work.
4) Leveling and strengthening of structural elements in stone, brickwork and tuff.
5) Laying and smoothing glass fiber mesh, a system for “reinforced” structural strengthening against stresses induced by seismic activity

SURFACE PREPARATION 
To guarantee good adhesion, special care must be taken when preparing the substrate.

1) It must be perfectly clean, sound and free of crumbling parts, dust, oil and old paintwork.

2) Sandblasting or a vigorous cleaning cycle with high-pressure water jets is particularly suitable for this operation.
3) If missing parts need to be replaced, integrate the repair with new stone, bricks or tuff with physical characteristics which are as similar as possible to the original materials used for the masonry.
4) Before applying the product, wet the substrate until saturated; do not leave pools of water on the surface.

MIXING
1) Pour component B (liquid) into a suitable, clean container with 6 liters water.
2) Then slowly add component A (Powder) while stirring with a mechanical mixer.

3) Carefully mix the R4 Flex Putty for a few minutes, making sure that no powder remains stuck to the sides or the bottom of the container.
4) Continue mixing until the components are perfectly homogenous (no lumps must be present).

      A low-speed mechanical mixer is particularly suitable for this operation, to avoid air being dragged into the mix.

5) Do not prepare the mix by hand.

APPLICATION
When laying glass fiber mesh
1) Apply a uniform, 3-4 mm-thick layer of R4 Flex Putty using a flat, metal trowel.
2) While the product is still “fresh”, insert the glass fiber mesh by pressing it lightly with a flat trowel so that it adheres perfectly to the mortar.
3) Apply a second uniform layer of R4 Flex Putty approximately 2-3 mm thick in order to completely cover the mesh.
4) Smooth the surface while still “fresh” using a flat trowel.
5) Adjacent longitudinal and transversal strips of glass fiber mesh must overlap by at least 5 cm at the junction points.

When used as a smoothing layer
1) Spread the mortar on the surface using a metal trowel at a thickness of up to a maximum of 6 mm.
2) Smooth the surface while still “fresh” using a flat trowel.
3) If a smooth finish is required, use R2 Finish Putty (single component, normal-setting cementitious mortar).
4) Due to the high bonding strength of R4 Flex Putty, even on metals,

     we recommend that work tools are washed with water before the mortar sets.

5) Once it has set, cleaning may only be carried out by mechanical means.

DOSAGE
1.0-1.5 kg/m2 per mm of thickness.
Less dosages for even surface.

PRECAUTIONS
1) No special precautions need to be taken when the temperature is around +20°C.
2) In particularly dry, hot or windy conditions, R4 Flex Putty must be cured carefully;

     we recommend protecting the surface against quick evaporation of water.
3) Do not apply R4 Flex Putty if the temperature is lower than +5°C.
4) Do not add cement or aggregates to R4 Flex Putty.