Blocking Primer is a protective primer. It is for surfaces sensitive to acids where application of Rust Spirit, Copper Spirit or Bronze Spirit is used.
Blocking Primer protects the surface from acid attack, preventing wood’s tannins from bleeding into the finish. It also prevents the “softening” of sensitive plastics.
Ideal uses for Blocking Primer
- Wood high in tannin content (Oak, Chestnut, Cedar etc)
- Use on plastics sensitive to acid to avoid softening
- Can be used on interior or exterior surfaces
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