All my past experience with track has been N scale Atlas track and cork roadbed. I find myself in unfamiliar territory. Just completed a KATO Unitrack layout in HO. I have decided to ballast, just not sure what size Woodland scenic size to use. My first guess would be medium, but perhaps on the Kato unitrack fine might be better. Also looking for a decent spreader that might give me the means to lay less center spread. Will use good old Elmers glue on the roadbed sides for ballast adhesion. Wet water and Scenic Cement have worked for me in the past to complete the job. Suggestions welcome!