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Right you are! I always do it with a shop vac right by my side - preferably one that can be fitted with a disposable bag so those little white beads never again see the light of day.
A hot wire cutter is neater, but then you wouldn't get those nice surface details such as you created by breaking. That's a good start to your canyon wall.
Jim
I hate using that stuff, it gets everywhere and cling. Ugh!
I used a technique long ago when I have N-gauge that worked surprisingly well. I'd use it again but have no canyons on my layout now.
- get a big heavy paper grocery bag and cut the paper out and lay it flat - I suppose you could use heavy brown package wrapping paper, too
- crumple it up tightly into a ball
- smooth and spread it out on a flat surface - it's all crinkled now
- spray it with clear lacquer or primer - this not only prepare the surface for more paint but much more importantly cements the shape of its surface a bit.
- now cut and glue mount it on canyon walls (liguid nail worked great and fills gaps, too
- paint it, apply vegetation, etc.
it worked out splendidly and is not nearly the mess!
The photo below is poor, about 15 years old and taken by a Sony .6 (yes, point six) mega pixel camera, but its the only one I can find of the last time I used the technique. It shows the canyon wall before painting, etc.