I'm currently trying to learn the use of layers. This is proving problematic: some of my favourite tools include the Variable Oil Pastel and Wet Detail Brush. Now, these tools are a joy to use. The blending of colours hits my happy spot! Sadly, when using these tools on a new layer it produces hideous white splotches. I have a vague idea of why this happens, and yes, I know I can't blend two colours on different layers.
At the moment I'm stuck using completely opaque colors when using layers, and it creates an effect I really dislike.
My question is this: how is it possible to create translucent colours and fade-outs, using layers (and possibly the afore mentioned tools), without creating those god-awful blotches of white? As in, a stroke, on one layer, starts out opaque, then gradually becomes transparent until it fades into the background color, which is on a different layer.