there are two type of washes: an overall wash and a pin wash. The overall wash is just that, using the wash to coat the entire surface chosen. A pin wash is used to get the wash in a specific area- panel line, two adjoining surfaces, around a rasied detail, etc.
A good idea is to perhaps practice your techniques on an old model before you try it on a more prized build in progress.
First, make sure your base paint job has had lots of time to dry and CURE. Usually several days.
For the overall wash, a wide flat brush is best used. For the pin wash, a small pointed brush of size 0 or smaller. On the pin wash, a pre wash of clean thinner overall immediately before the pin wash will allow the pin wash to flow better and reduce the "pooling" marks that can occur.
After applying the wash and giving it a short time to dry, use a brush lightly moistened with clean thinner to remove excess wash.
I prefer doing my washes with enamels, but you can do the same with acrylics. just beware that some acrylic thinners (gunze in particular) will remove the paint below in addition to any excess wash.
A good idea is to use a clear coat beneath the wash opposite of the type of wash being used- enamel or lacquer below acrylic, and vice versa.
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LSM