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Weathering powder itself is quite fine, any texture you get comes from how you mix it with things that thicken it up (varnish, sand, plaster, etc... in this case the matte coat). If you keep that in mind, you should be able to avoid excessive texture.
That said, I've never tried that specific method. I feel like you'd be best off sticking to the specific products used in the video (humbrol matt cote, humbrol enamel thinners) as not all enamel thinners are created equal and some will attack acrylics as readily as they do enamels. There must be something magical about the humbrol one that it doesn't, lol. I actually have some humbrol enamel thinners that I use when airbrushing humbrol enamels, but I've never tried to use it in the way he does in that video.
I also wonder what brand acrylics he's using. Again, not all acrylics are created equal. I haven't done extensive studies on it, but Humbrol Acrylics for some reason are a lot tougher than Vallejo Acrylics (I can spray a humbrol acrylic and then apply masking tape a few hours later without worrying about it, vallejo acrylics I have to prime first, basecoat with the colour, varnish, wait a couple of *days* and then still sometimes the damned things lift off much easier). I dunno, might be something to keep in mind!
It is a pretty cool effect though. I know what Rickfactor is talking about with putting the powders on later, but the way it's done in the video can create a really impressive rust stained look that is difficult if not impossible to create when you add the weathering powder later.
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