I use WS fine in the yards, and a mixure of fine and medium everywhere else. Next time I will use AZ RocK ballast.
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I use local beach sand, washed and dried, and I use plain old PVA carpenter's glue, the yellow stuff. I dilute it to about 6/1 in favour of the water, somewhat more even, and add the couple of drops of dish detergent. I also don't soak the ballast thoroughly as some say they feel they must. I just form a hard shell in what is there so that I can make repairs and relocations easily when I must take up the track.
-Crandell
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WS Medium for me, too. In the subways I used WS Cinders (black) and I blended them with the gray for the transition from daylight to tunnels.
I use diluted white glue with an alcohol pre-soak, too. I use the alcohol straight from the bottle, mostly because it's cheap, and I'm too lazy to mix batches with water just for this purpose. I apply both the alcohol and the glue with a pipette. I tried spraying the alcohol, and it just made a mess.
I've got a small amount of WS Fine ballast, which I use for roadside gravel.
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Besides trees, few things seem to make a layout seem finished better than ballast. A couple of questions about your preferences and techniques on the subject.
I've used matte medium (Modge Podge) and white glue (Elmers) diluted 60 -70% with water applied over thoroughly drunk (alcohol) ballast. Other than being cheaper, the white glue seems to work better, as I find cleaning up the strays with the matte medium is more difficult.
Also what size ballast do you prefer, I'm in HO and have been using medium size WS. After a day spent on layout tours, I decided to try some fine size and I like the fine substantially better.
What say you?
Joe Daddy