My stencils bleed through the black areas - Best way to make one?

[justaviking]

This is my first post.  Please be gentle.

When I paint using a stencil I made, some paint appears even where my stencil is black.

I have white lettering on a black background.
If I keep "scribbling" in the black area, paint gradually appears.
The ones included with SP work correctly, and nothing ever appears in the black areas.

I saved it as a PNG file, and did File --> Import Image.
I have tried various formats; gray scale, 24-bit, JPEG, etc.

My Stencil is still a "picture" and not a "material" like the ones that come with SP.

Any clue what I need to do differently?
Thanks.

[Jeremie Noguer]

Are you sure your transparent parts are 100% transparent? With a heavy flow on your brush, it may accumulate very quickly even if there is 1% opacity on these parts.

[justaviking]

Thank you.  It's working perfectly now.  As you suspected, my "black" was not a pure black.

I would have sworn it was a BLACK background.
I even picked it off a "palette" rather than a color wheel to be sure.
Strangely, the "black" in the color pallet in my graphics tool was not 100% black.
I don't know why.  Oh well, just another mystery to investigate.

BTW... I am in love with Substance Painter.  I've been playing with the trial version for a few days, and will by buying it before the end of the month.