I have extended my pier foundation garage (Älvsbyhus) and joined it to a slab-on-grade. To cover the joint in between, I would need some form of leveling compound that does not become 100% hard but retains some flexibility, as some natural movement likely occurs between the garage sections. Yet, it needs to be hard enough to drive a car over. Something like self-leveling compound or similar, perhaps?
An alternative is a metal plate over it, but I would prefer a less visible joint that doesn't collect dirt.
It concerns an area of 6 x 0.2 meters and about 15mm deep at its deepest point that needs to be covered. It is currently a regular unpainted concrete floor.
Something that might work is what plumbers use to waterproof plumbing installations?
Does anyone have any suggestions?