Bridgework from acoustic tiles

Pete - thank you so much for your superb highly detailed explanation. You shared quite the boatload of very helpful tips which will go a long way to helping anyone turn out a realistic looking rock wall. I’m planning to use this sedimentary rock wall technique along most of the length of the entire back edge of my layout with a painted backdrop above it. I’m thinking the base of the wall should be made a wider width which becomes less wider and tapers off to form an upslope.
Thanks again,

Walt

BTW - I once owned a Cadillac Allante which rhymes with my last name Fanti and sounds similar to your screen name Avanti.

@Kitbasher wonderful work! Just beautiful! Thanks for sharing. I know this is somewhat off your original topic, but I am very impressed with your girder bridge weathering as well. Can you tell us how you accomplished that? Thanks again!

Most of the girders were weathered using the salt weathering method.  We the surface (after spraying with a rust color) and then sprinkle salt on them. Once the water is dry, spray with the base color (gray). Once dry, scrape off the salt.  Then I made streaks with a drop of burnt umber oil paint, then swipe down with a fan brush, lightly dampened with thinner. I describe those techniques in my videos about weathering rolling stock, here - https://www.youtube.com/channe...Q?view_as=subscriber

@Kitbasher posted:

Most of the girders were weathered using the salt weathering method.  We the surface (after spraying with a rust color) and then sprinkle salt on them. Once the water is dry, spray with the base color (gray). Once dry, scrape off the salt.  Then I made streaks with a drop of burnt umber oil paint, then swipe down with a fan brush, lightly dampened with thinner. I describe those techniques in my videos about weathering rolling stock, here - https://www.youtube.com/channe...Q?view_as=subscriber

Once again thank you for your response!

Mike