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If you are wanting to "Tile" your texture, use a much smaller bitmap for "concrete" for example, then scale your UVW Map much, much larger than the bitmap.
The smaller bitmap will then "tile" (repeat itself) as often as needed. The problem is that all of the "seams" will be running in the same direction, and that may not be the effect you wish.
In that case, add edges where needed to create separate polygons that you can individually UVW Map and then rotate as needed to get the "seams" to run in the direction you want...


You're on the right track. You need to use layering to make the transparencies work for you. If you had something underneath, the transparency would reveal it.
Re: the edges, he meant basically dividing the polygon into smaller polygons. Use the slice tool, then you'll have another polygon where you can re-tile at a different angle or in another texture, say if your apron goes from asphalt to concrete, or changes direction.
