Those are some really nice flat roof techniques Ed I took some notes and put them in my railroad log.
I will have a big flat roof of my scratch built round house one day
TF
If I have a building that will be in the foreground I'll sometimes use a printed sheet roof which can mimic tarred roll roofing:
PO_annex2 by Edmund, on Flickr
There are dozens of "Textures" available at this site: https://www.textures.com/
You can download a limited number per day with a simple registration. I use it for interior walls, carpets, roofing, of course and brick work.
PO_annex1 by Edmund, on Flickr
I use a vector-based editing software, Affinity Design or Corel Draw, in combination with Photoshop to copy, blend and merge the images then print on a medium-quality matte photo paper.
IMG_4630 by Edmund, on Flickr
Some images are labeled "seamless" which means they're designed to be stitched together without seeing gaps in the image.
TexturesCom_RooftilesBitumen0029_1_M by Edmund, on Flickr
https://www.textures.com/category/roofing/108
Good Luck, Ed
It's hard to see the roofing from the Walthers pictures, but I seldom use the supplied roof parts with kits like this. Instead, I get some 3/8 inch posterboard, the foam stuff with paper coating, and cut appropriate pieces with a sharp utility knife. I usually add more support inside with balsa wood strips, particularly around the edges. I paint the roofing with Rust-Oleum as above before installation. The balsa wood strips will prevent light leakage around the edges of the roof if you illuminate the structure.
Depending on your viewing angle, you might want to consider a bit of additional roof detailing. A few vents might be appropriate. One thing I notice about most plastic structure kits is that there are brick walls on the outsides, but around the perimeter of the roof is typically a low parapet which is flat and untextured.
For these, lately I have been cutting thin strips of brick sheet, 3 or 4 bricks high, and painting and mortaring the strips to match the outside bricks. This gives a nice finishing touch to the roof.
It takes an iron man to play with a toy iron horse.
I have been using Rustoleum and Krylon textured spray paints on my layout with great results. Rustoleum "aged iron" is textured flat black I use for tar roofs and parking lots. The "Caribbean Sand" and "Desert Bisque" for aged concrete like on the interstate highways with that yellowish tan tint. Krylon has some good ones like "Black Granite" I used for faded textured asphault roads and parking lots. Their fine stone textured paints I use for dirt roads, dirt lots etc and they have a variety of colors. Both websites have good pictures. And the price is good for 12 ounces.
I like Rust-oleum textured specked black spray paint. It has a little bit of metallic flaking in it, but otherwise gives a nice asphalt-like surface, that can be weathered with gray or some rust if you'd like. I use it for all my flat roofing, and even for some shingles on sloped roofs.
Always clean the spray nozzle thoroughly after each use, or the paint will harden inside it.
Hi,
I keep a rattle-can of this Rustoleum Automotive sandable primer on hand:
Sandable Primer
It is not quite black but a very dark gray. It has high solids so it will build up with each succesive layer. Takes a while to dry.
I often use it to simulate an asphalt-tar roof. I use it for a light coat of "soot" on Heavyweight passenger car roofs too.
It woud have whats called a built-up flat roof, usually starts with a layer of rigid insulation, than layers of tar paper and mopped on tar, finished with a coat of stone ballast.
Todays version would be rubber roofing, over the insulation, with the ballast being optional.
Do some Googling around for commercial building flat roofs, and you'll see lots of examples.
The Tamara paint sounds like a good idea.
Also Google Walthers Magic Pan Backery, and you'll see images of what others have done.
Mike.
My You Tube
Walthers Magic Pan Bakery.
What kind of roof does this structure have; I was thinking a tar roof. I'm looking for a spray paint I can use on this. I'm thinking about Tamiya rubber tire black because it would give a more faded black look.