Game Development Reference
7. Use your layer masks to fade out all the edges of your images. This has the effect of
paining in the same color as your paintwork..
Take special care to reach the areas where the front, side, or rear view textures join
adjacent textures, such as the frames round the windows.
Now, reduce the opacity of your brush to 30 and go around again, blending the
edges into the background gradually. You should have something roughly like