
Originally Posted by
Simon Barden
Hi Aiden and welcome. It's going to be very hard to keep the stain from leeching under the tape - both water and oil based stains will naturally soak into the wood if rubbed on, so the edges are likely to look fuzzy.
If you read the small print on Frog Tape (designed for decorating), it states that the glue reacts with the dried emulsion underneath it to form a barrier to any fresh paint being applied. So it's not going to be perfect on bare wood. Probably a bit better than standard masking tape, but still a bit leaky. If you've already got any stain, try it out on some scrap wood and see what you think of the results.
Otherwise you could consider the following:
If you have access to an airbrush (you can get really cheap airbrush + compressor kits on eBay), you could probably spray the stain on in several light layers, so that the wood doesn't get too wet and the stain runs under the masking tape.
Or you could try masking either side of the stripe and spraying several layers of some clear lacquer onto the stripe. This should protect the wood under the stripe, plus soak in a bit to the wood as well. I'd be tempted to then mask off the clear stripe before staining, just in case the lacquer took up some of the stain (though with water based stain it should simply wipe off with a damp cloth before it dries). Again, try on some scrap wood before using it on the guitar. Tru-Oil seems to go over any finish, so I don't think there would be any issue with the clear lacquer (again - scrap wood test first).