Topsoil and over seeding

You should use a thin layer of good compost not topsoil raked it after seeding to make sure the seeds have contact with moisture and soil. Keep damp in dry spells and be patient. 2 weeks you should start to see seeds sprouting

Hi Aaron, If the lawn is good and level then you may not need much topsoil. When I scarify I leave the rake deep which then provides a good amount of topsoil for over-seeding. At the same time, if you are overseeding the entire lawn try not to worry too much about varieties compared with trying to match up and patch-seed. The hardier and thicker varieties of seed will contain some rye grass as opposed to the finer 'bowling green' lawnseed. If it were me, I would get my scarifier out again, over-seed and feed the entire lawn with a hardier variety and water in immediately (many dry feeds require watering in to avoid burning). You can't be too generous; a spreader is a good idea; otherwise a good handful of seed every square meter is my metric. All the best Dan