Pls Pls help with Ceiling, Christmas next Week!!!

Hi

I may have taken on a bit to much before christmas but here is my problem.

I went to paint my sittingroom ceiling, using crown ceiling paint, as I was rolling on the paint, the old stuff start bubbling and flaking off.

I had this problem in my boxroom, and will probably have it in all rooms, but I got a professional in the last time to fix the boxroom.

Can't afford professional this time as I lost my job.

So back to the job, Ive sanded down where the paint has come off and feathered around the edges. Ive purchased polybond universal and pink to white Dulux ceiling paint, as Im probably going o have to do it at night at this stage.

My question is what ratio of polybond to water should i use. Im planing on spraying it on the whole ceiling to seal the old paint to stop it coming off.

Also how long should I leave it dry before I can paint the ceiling.

Thanks for any help