bakoart:
(Below) For tight and precise areas like in and around turnout parts or I use Elmers bottles for both wetting and applying the glue. The shape of the bottles is comfortable in the hand and the tips contol the flow as long as you have good clean heads. It's a cheap and easy set up. Hope my tip works for you.
Don't squirt the alcohol or glue mixture to hard or you'll wash your ballast away.
Good luck Ron & Have fun!

I just happen to notice the Elmer's "School" glue. I bought a dozen or so of those small bottles, mainly for the containers to use as you descibe.
I noticed that the "school glue" is not the same as the regular Elmer's white. Just dumped out the glue and washed the bottles. Just didn't figure these woulkd be a diferent formula. No matter though, they were like 4 or 5 ror a $1 at walmart.
I find that the diluted white glue and a mix of "wet water"/ alcohol mix is fine for ballasting. In place of the $$$ WS scenery cement the diluted matte medium work great for scenery purposes. Following Dave Frary's direction on mixing the matte medium and allowing some filler to settle before it's use has really worked quite well. The final dilution of the matte medium for use ends up to be about 4-6:1 pending the scenery use. 1 quart of matte medium produces about 1 to 1 1/2 gal of scenery cement.