Morning H,
I'm aware of Mr Nevard's DAS methods but honestly never fancied it myself. I use the finest ballast I can find, normally Woodland Scenics as I'm yet to find any that is finer. However, DCC concepts 2mm Legacy ballast is pretty close, if not the same but not tried.
WS's fine cinders, if time is spent tamping it down works well enough for me. In stages then,
I paint the track a brown base colour. From then on it's weathering powders for the rail sides and sleepers until I'm happy, then seal in the powders with matt varnish. Only then do I ballast then add the PVA/water/W.U liquid to glue down. Then you find out how well you sealed the powders !!!
So my track looks like this before ballasting.
Then add ballast ( Woodland Scenics fine cinders )
But this obviously won't work when using DAS.
I know Tim Maddocks uses a different technique, more suited to a slimmer sleeper, rather than the above which I use on PECO Streamline. His approach involves PVA being painted between the sleepers, then the ballast is sprinkled on.
Hope this provides a different perspective,
Rob.