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A 25 year old ceiling had popcorn and was scraped 5 years ago. It is an eyesore, so the decision has been made to apply knockdown. What (if any) preparation is required to apply knowckdown? Any lessons learned area appreciated. Thank you

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Bonding primer is never a bad idea. Seals and solidifies what's there now, and lets the new finish adhere well.

Oh, and some decent shoulder warm-up exercises are a good idea too...

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