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How to fill mortar gaps between concrete block walls?

moiranne
Community Newcomer

How to fill mortar gaps between concrete block walls?

My aim is to use Murabond cement based paint (with added sand) on my block walls to give them some texture. And cover the mortar gaps. 

First i need to fill the mortar gaps. 
My plan is to seal them with Bondcrete then fill with mortar with some Bondcrete added. 
 I’m not sure if possible for a handy amateur. 

Is there an easier way with an engineered filler?

I would like one pass to be sufficient.

 

Appreciated.   

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