Photoshop :: Brush With Wet Edges

Is there any way to get an application of a brush with Wet Edges to absorb seemlessly into a previously applied area of the brush with Wet Edges? As far as I can see, if you paint a bit, say in Pattern mode, stop painting, and then start to apply the brush again, the paint visibly overlaps the previously applied colour. This makes it impossible to easily create brushed watercolour washes without keeping your brush in contact with the paper (in my case a digital tablet) all the time; if you lift it off for a second, it applies a new coat of paint (or pattern) over whatever is there already. What I'd like is to be able to get a wet edges brush to meld seamlessly into a previously applied area of paint (or pattern).

Is this possible to achieve, please?