Yes, I have heavy clay soil. I had been doing traditional tillage for years. It wasn't until a soil scientist friend of mine sent me a recipe for creating a good solid dirt road. It was exactly what I had been doing. Clay soil, especially exposed, will crust or glaze and rain will become runoff and you are left with concrete.I spread some clay from a pond dig in early august. I'm way up north, like 5 weeks away from first frost at this point. That being said, I was still very worried about seed laying on the surface to bake. As soon as I had my dirt spread out, I gave a hot dose of gypsum to help mellow out the clay, and then sprayed on my seed. Then I covered it all in hay as an introduced thatch layer to keep that seed moist, covered, and to keep that clay from sealing up.
I'm glad I did, because I got a gully washer of a rainfall, and had that seed been exposed, it'd have all washed away, and i'd been left with new concrete.
For quite a few years, when I converted to no-till techniques, I had to use a tiller heals very high on a 3-point hitch. It barely touched the top inch but was just enough to break up the clay crusting.
Over the years, a smart mix of C based crops and N based crops (legumes) and avoiding tillage, built my OM to the point my clay no-longer crusts. I never leave the soil uncovered and the improved nutrient cycling has allowed me to avoid the use of commercial fertilizer for over 5 years now. When combined with much greater weed tolerance, my plots are now benefitting deer even more at a much lower cost which allows the saved resources to be used for other habitat improvement.