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How do you stop stain from bleeding into wood under taped areas.

I was building an electric buitar with a curly maple top, laminated to a piece of mohogany. I wanted to the top to be stained, and the mahogany to be natural. I used green painter’s tape to mask off the mahogany, but the stain bled through it. I tried it another way — masking of the curly maple and staining the mahogany (on a different guitar) and I got the same bleed through.

Any suggestions about how to get a perfectly clean edge, with now stain buildup, bleeding or clumpy spots of stain?