Use Fiberlock IAQ 3000 to fill small imperfections and pinholes in masonry block and porous concrete before a top coating. Its flexibility and durability are the best available for a block filler; far superior to cementitious and PVA type formulations. Fiberlock IAQ 3000 contains mineral type fillers and fine mineral aggregates that provide a uniform surface capable of receiving all types of finish coats.
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https://www.fiberlock.com/wp-content/uploads/IAQ-3000-8330-SDS.pdf