MasterFinish 380 Surface Retarder
Surface retarder for horizontal exposed aggregate concrete surfaces
Item Code
See Availability Tab
Pack
Drum 20L, 1000L
Surface retarder for horizontal exposed aggregate concrete surfaces
MasterFinish 380 is a water based chemical retarder used to expose the aggregate in horizontal concrete surfaces. MasterFinish 380 delays the set of the mortar paste on the surface to a controlled depth. MasterFinish 380 does not kill the set of the main concrete. The retarded mortar paste may be removed by washing and brushing after the set of the concrete to expose the aggregate.
Controlled retardation of concrete surface which produces consistent textured and attractive exposed aggregate surface.
| Code | Item | Pack |
|---|---|---|
| 15875 | BASF - MasterFinish 380 Surface Retarder 20L | 20L | 17885 | BASF - MasterFinish 380 Surface Retarder 1000L | 1000L |
Apply a uniform application of MasterFinish 380 to the freshly placed horizontal concrete surface prior to initial set, as soon as free-bleed water is dried. A low-pressure garden sprayer is ideal for the application; alternatively a soft bristled broom can be used. Once the concrete has set (within 12 hours) the soft cement paste may be brushed off.
The surface should then be washed using highpressure water to remove the remaining paste exposing the aggregate.
The treated concrete surface should be protected from excessive drying effects and it may be necessary to use a higher application rate to achieve the desired result. The exposed aggregate surface following treatment should be cured in the normal manner with MasterKure 402. Also use MasterKure 402 to maintain a high quality glossy appearance.
NOTE: Retarded concrete will eventually harden so the surface should be checked periodically to determine the degree of exposure required. Allow shorter times in warmer weather. Hardened treated surfaces will show patchiness and uneven effects
MasterFinish 380 should be applied at a consumption of 0.2-0.3 L/m² (this will provide approximately 5 mm depth of retardation). In windy or hot conditions it is recommended to apply at a rate of 0.3 L/ m² and if unable to remove surface paste in the short term (6-8 hours) then two applications should be used.
