Screeding a kitchen floor

I personally never used black jack but I think there is two latex self levelling products that can be used

You can but you need to Prime the floor with a Primer called P131 first, then you can put the latex down after that has dried.

Yes, you can use latex self-leveling compound over a rolled black jack pdm on your kitchen floor. The self-leveling compound will help to create a smooth and level surface, ensuring a proper base for further flooring installation.

Yes that’s ok but I would use a dry zone product it’s a DPM and I would apply two coats and I would go 150mm up the wall to make sure no damp can get through. This product will last longer