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does anyone have any ideas how to prevent bleeding onto top or trim when useing nitro on cocobola

I seal all areas with diluted shellac. Specially bindings,trim and top. That normally takes care of it.

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Peter M.
Cornerstone Guitars
http://www.cornerstoneukes.com

Depending on the type of finish going over it you might try a vinyl sealer

You can use lacquer, vinyl sealer or shellac. You need to seal the light woods and trim before you pore fill. I use small artist brush and linen cloth depending on the wood and trim to be sealed. most rosewoods or redish or dark woods will have a lot of oils in them and cause this issue. This is just a standard part of finsh prep for me.MichaelP39042.6689236111

Yes, the important step is sealing the light colored wood. The dyes in coco
will dissolve in all of the normal finish solvents. It helps to try and avoid
letting finish on the coco from being dragged onto the light wood as well.
Hard to prevent, though, so sealing the light wood will help a lot. It's
definitely worth the trouble - cocobolo has become my favorite guitar wood
lately.