Hi all, I'm turning my garage into an office so will be adding stud wall, insulation etc.... I want to self level the floor but its incredibly dirty even after jet washing and quite uneven (both chips and raised bumps in the concrete with quite a few cracks as you can see). What is the best way of going about it? Also would I need to put down some sort of membrane first? Or will priming the floor then self levelling be sufficient? Cheers.