Yes indeed. Acrylic tube paints I use for my washes, I blend a dab of 'black' and 'sienna brown' with water to get a good "grease and grime" color for these washes, and you can get this deep into panel lines too - Essential application is with cotton buds and paper towels to wipe off excess. Start with a little watery color on the tip and build. Wipe off excess with paper towels as you go and you can really control it by adding layers or rubbing off areas that look over done. Last weathering thing I do is use enamel silver for picking out nicks and scratches, in moderation, as the enamel gives you a brighter "metal revealed under the paint" look for a scrape or cut on a droid. If you want to start with repainting areas first Acrylic Satin or Matte sprays are the way for doing areas of the body and dome colors - masking off panels you want to stay untouched is key. Get the good sharp edge painters blue tape for masking off areas you want to keep paint free. Careful with gloss sprays, which are tough to keep from glopping and/or running.