Apply the ballast to the track dry, be careful on points, don't get it in the way of moving parts. Once it is where you want it apply a mixture of PVA/water with a drop of washing up liquid. I mix it 20 parts pva to 80 of water. Drip the mixture on to the ballast with a pippete or eye dropper. It should spread through the ballast, that's what the washing up liquid is for. Leave it to dry. The stronger the mixture the quicker it drys. A weaker mixture takes a bit longer but drys like toffee not concrete, easier to remove if necessary. I use one of these. Very cheap. /media/tinymce_upload/5801ba9453465761fec2a6fd6196c0ba.JPG