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I'm working on using weathering powders on my IG tanks. I'm applying powder, and setting it with rubbing alcohol. Everything that I'm reading online is telling me to finish with a coat of varnish of some sort. Didn't want to use the spray because I read that sometimes the powder will get blown off, so I'm using GW's Lahmian Medium. However I let it sit to dry overnight, and now I have white clouds over my powder. Am I just using too much? Should I use 'Ardcoat instead? I've also read that some people use hairspray. Would that be better? Any help would be greatly appreciated.

Lahmain medium is not a varnish, it is unpigmented paint.

'Ardcoat would have been a better choice for sure. Hair spray works to hold temporarily before the final sealing, you can use a pump type instead of an aerosol for less force. Personally I would airbrush Future floor finish on a low PSI setting to seal, followed with testors varnish.

Ouch that definitely did a number on your paint job.... you might be able to get off all that built up powder with a good stiff toothbrush or any bristle brush. Maybe restore the paint before you go back at it.

Sprays arent bad for powders, just spray at a bit of a distance say 1 to 1.5 ft away. I use Testors matt varnish, never lets me down. Future wax ive found can result in a shiny finish (which is fine if youre going for a wet mud or oily-greasy look)
If youre not a fan of using the sprays you can always go the brush on route - using White Spirits (UK) aka Mineral Turpentine (N.America) - found very cheap in most hardware stores in the paint section.
Can find it in art stores too (just a higher end formula, but basically does the same thing.).

This article may help you a bit - http://www.forgeworld.co.uk/Downloads/Product/PDF//w/weathering-powders.pdf" target="_new" rel="nofollow"> http://www.forgeworld.co.uk/Downloads/Product/PDF//w/weathering-powders.pdf

Good luck!

Or paint that with heavily diluted <pick your supplier> brown paint. If this is not working - go as per Akrim's advice.

Cheers

That's some pretty nasty frosting, but don't lose hope. You may be able to get rid of at least some of it by coating with gloss varnish, after which you can apply another matte coat to kill the shine. Another application of pigments can mask any lingering white (more naturally than painting it, although that would also work), if necessary, before the final matte coat.

When sealing, go ahead and use a spray varnish. Setting pigments with rubbing alcohol doesn't make them bulletproof, but it's more than strong enough to resist the gust from an aerosol can.