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The Importance of Bonding Primers
"Without it (bonding primer), there's nothing for the coating to grab onto," says Pachade. If the concrete substrate is not primed, "You'll see pinholes because the concrete is breathing."
by Dave Searls
Bonding primers serve two purposes when applied to concrete before topcoating, according to Victor Pachade, national sales manager for Smart Surface Technology, manufacturer of Colormaker products. “They seal the concrete surface and develop a bond line for a coating or topping to bond to the substrate.”
Concrete isn’t usually a good substrate for holding coatings because of its high porosity and alkalinity. “Without it (bonding primer), there’s nothing for the coating to grab onto,” says Pachade. If the concrete substrate is not primed, “You’ll see pinholes because the concrete is breathing.”
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