Joined: July 2004
||Posted: 31 July 2019,19:25
Using SBR, either as a primer or in the bedding mix, will do precious little about efflorescence. A properly prepared primer slurry (SBR plus cement works adequately) will help minimise the risk of eff, but nothing can guarantee to "prevent" it happening.
The good news is that this is the low season for eff problems. Warner temps and allegedly drier days (it's persisting down outside as I type this!) all help keep it to a minimum, but, even so, there is always a risk it may show up.
Having said all that, SBR most assuredly *will* improve adhesion, but, to be honest, adhesion is not usually a problem with sandstone flags when laid on a moist or wet-mix mortar.
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