I needed to make a relatively large expanse of station yard and road on Valdieu-Lutran. I decided that chinchilla dust, a form of powdered clay, would be a good base. I initially tried to stick the dust to the baseboard using diluted PVA but this was unsuccessful because the clay did not stick well. After the glue had dried the dust easily rubbed off.
I therefore undertook some experiments to find the most effective method of sticking the chinchilla dust.
I tried wallpaper paste, Aleene’s Tacky Glue and 3M Spray Mount Adhesive on test strips. The best by far was the 3M Spray Mount Adhesive. This required extensive masking of the board to prevent contamination of the track etc. but was the only adhesive that gave a good finish. The chinchilla dust was sieved using a metal sieve to use only sub 1mm particles as the road surface.
To seal the surface ready for any paint or chalk effects to be added the dust was sprayed with a good coat of Testor’s Dullcote varnish.
I also added some static grass at the end of the embedded track in the station yard to add some variety.
From this trial this method will be used in future where stony ground cover is required.
I decided that I wanted in future to use chinchilla dust particles of less than 0.5mm size. I bought a cheap 0.5mm sieve off of eBay that fitted into my plastic funnel. I taped the vibrator I use for paint mixing onto the assembly. This is how it works
I now have 2 bottles of pre-sieved chinchilla dust ready for use.
p.s. 98% of the chinchilla dust I bought is <0.5mm in size.