The only thing I can would suggest with them is wear gloves because your finger prints will show up in it. Also use a shot of dullcote to seal the powder in otherwise it will eventually wear off. Those cars ended up finished up with a little airbrushing to make them how I wanted them
The tamiya weathering sets are almost like panpastels. I would rather use the Vallejo acrylics as well but these work good as a base for weathering. A shot of dullcote may not be a bad idea as a base coat for the powder to stick on better also
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