GLOSSARY TERM
Block Filler
A thick paint used to fill porous surfaces like concrete blocks before applying the topcoat.
INFO
What it is
Block filler is a thick, high-build coating used to fill the open pores and small voids in porous surfaces such as concrete block and masonry before the topcoat is applied.
Why it matters
Porous surfaces drink up paint and leave a patchy, uneven finish. Block filler seals and smooths the surface first, giving a sound base that improves appearance and reduces topcoat consumption.
Where it is used on a project
Applied to bare or rough masonry, concrete block, and similar porous substrates, typically as a preparation step ahead of the decorative or protective coats.
How NECC approaches it
Where a surface is porous, we use a suitable filler or high-build product to seal and smooth it before coating, so the finished result is even and the topcoat performs as it should.
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FAQ's
What does block filler do?
It fills the open pores and voids in block and masonry, creating a smooth, sealed base so the topcoat looks even and uses less material.
Is block filler always needed?
On porous surfaces, yes. Without it, the topcoat can sink into the pores, leaving a patchy finish and poorer coverage.
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