04-13-2012, 11:52 AM
If it's 1/4" you need, simply use the Masonite. Paint it a concrete colour, then draw or paint lines to represent expansion joints. After it's in place, weather it and the boards around the rails using an airbrush and/or pastels.
If you want to use something along the lines of what Galen has suggested, Durabond patching plaster can be mixed to just about any consistency you like, yet still set-up within the specified time. It doesn't crack regardless of how thin or thick it's applied. An added detail would be to scribe it to represent bricks, but you'd need to do so as soon as it solidifies - waiting until the next day may allow it to get too hard. Hydrocal or dental plaster would work, too, and could be scribed at any time. Colour any of these with a stain or wash after the carving has been done.
Wayne
If you want to use something along the lines of what Galen has suggested, Durabond patching plaster can be mixed to just about any consistency you like, yet still set-up within the specified time. It doesn't crack regardless of how thin or thick it's applied. An added detail would be to scribe it to represent bricks, but you'd need to do so as soon as it solidifies - waiting until the next day may allow it to get too hard. Hydrocal or dental plaster would work, too, and could be scribed at any time. Colour any of these with a stain or wash after the carving has been done.
Wayne