is it good to use on hardi plank siding>
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Yes, the OSI QUAD Sealant is suitable for this use/application. Just make sure the siding surfaces are clean, dry, and free on contaminants including any cement fiber dust and that any bare edges are sealed with a primer/paint. However, keep in mind that James Hardie does recommend the OSI QUAD MAX sealant on their siding as the better alternative.
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