Hi, Ratboy!
I gave stencils a try for the first time on the last kit I finished, Dragon's E-100:
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Just a couple of simple numbers, but I really liked the way it turned out, and it was very simple to do.
I used the "German Numbers, Large" set from Eduard. They make all kinds of masks and stencils for armor and aircraft, but you could really use anything!
Just becareful and go light on the coats. I got a bit heavy on one side and had a wee bit of seepage I had to clean up later.
Give it a shot!