I have used this one and the model masters burnt iron. They are 2 different colors and both are great. This one has more of a grey color as the model master looks more brown.

I bought this along with the exhaust manifold, pale blue, and jet exhaust for shading aircraft exhaust areas. There wasn't a ton of difference between this and the exhaust manifold so I could have just used one and diluted or something. still, it produces the intended results by layering the different shades & gradually blending exhausts.

Great for exhausts and engines. No brush strokes. Goes on smooth.