Waymark / Routes / astm.org Select and apply plaster bonding agents for gypsum plaster over concrete or masonry
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps Confirm the substrate (monolithic concrete, masonry, or other non-mechanical-key surface) requires a bonding agent before gypsum plaster application Select a bonding compound meeting ASTM C631 (bonding compounds for interior gypsum plastering) as applicable to the product type Apply the bonding agent per the manufacturer's coverage rate and drying time before plastering, since under- or over-application affects bond strength Verify the bonding agent is compatible with the specific plaster formulation being applied over it Test bond strength or follow manufacturer QA guidance on a mockup area before full-wall application on critical projects Known gotchas Skipping the bonding agent on smooth monolithic concrete is a common cause of later plaster delamination Bonding agents have their own application temperature and drying-time requirements distinct from the plaster's own environmental limits — check both Not all bonding agents are interchangeable between gypsum and cement plaster systems; confirm the product is rated for the specific plaster type
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