Scraping off one texture, and replacing with "knockdown"

Originally Posted by OraarO

The rooms have painted acoustic (popcorn) texture now. I plan on scraping the tops off, as much as possible with one or two quick passes. Then skimming on up to two coats, applied horizontal and then vertical to minimize "skipping" over the remaining texture. Once that is sanded close to smooth, applying a knockdown texture by spraying thinned compound and then knocking it down.

Question - Do I need to prime the skim coats so the knockdown texture doesn't "re-activate" the mud that was skimmed on?

Any other tips on doing a job like this? I have a bid I am comfortable with for this, but looking to save time/steps wherever possible.

Thanks.