Painting - bathroom ceiling paint bubbling as I put it up-help!

I bought a house that is 30 years old and am trying to redo a few things. The ceiling in my bathroom (which doesn't have a vent) had old popcorn ceiling that began falling down in large patches. I was able to take it all off relatively easily with a putty knife. The sheet rock underneath was the color of cardboard and it has large areas where someone had applied some type of white substance. I sanded down the rough areas then primed it all with
No. 75 Behr enamel primer. I then tried to paint it with Behr smooth texture paint no. 1001. (I'm trying for the tradional stucco knockdown effect) As I was putting the first coat on I noticed after awhile that it began to develop large bubbles in the areas that had the white substance on it. I let it dry and now it just peels right off like I didn't even prime it? Any suggestions out there? Thanks for any help!

oil primer, oil primer, solves all issues.

Thanks for the help, I will re-scrape and try it. :)

How long did you let the primer dry before applying the finish paint?

I would say I let it dry between 24 and 30 hours. It is interesting that it started bubbling on the white substance that was on the ceiling, looks like someone tried to patch something but there wasn't a hole-no method to the madness!

I suspect that you didn't remove all the texture. When it got wet from the latex paint/primer it softened up the remaining texture causing it to loose it's bond with the drywall.

Painter guy is right that an oil base primer would have prevented the problem. You can either remove it all and start over or repair the affected areas and reprime.

many thanks to those that helped! I primed it with oil base primer and it worked beautifully :) thank you for the info!