Blend it out like any spot repair,you just need to run a nice straight pass on the blend edge.Some say it's easier to put the darker over the lighter and vice-versa,but I haven't done but a few.I do like to have a gun with each color I'm working with so if I screw up I can grab the other and correct it.You may have to thin it down a little extra (or clear it down) if the blend edge looks too coarse.That all depends on how well your gun breaks up the base.I can't tell you anything about Satas.