When should HHCB be applied in relation to plugging holes?

• A. After plugging holes
• B. Before applying OsmoFume
• C. Before plugging holes
• D. Only if instructed

Answer: (C)

Applying HHCB before plugging the holes allows the chemical to move into the wood through those openings and reach any pests or treated areas inside. If you plug first, sealing the holes can trap the chemical and block its distribution, making the treatment less effective and potentially leaving untreated pockets. Sealing after application helps contain the treatment and ensure proper exposure. Only following specific instructions is not the general rule here, since the standard practice is to apply before sealing to achieve proper distribution.