Bill,

Interesting. I have stained many of them using a variety of techniques. Most commonly I use leather dye diluted in isopropyl alcohol. I also use acrylic paints, also diluted in alcohol. Some time there are areas that are more resistant than others, I think due to natural variations in the wood used. I just leave more stain on those areas, longer. If it truly resists staining I would suggest opening the grain with some heavier grain sandpaper, such as 200 or even 120 grit, or even raising the grain a bit with a quick exposure to water. Test and apply more heavily if needed.

Regards,

Bruce Smith

Currently situated at "MDT", which is the really cool airport code for Harrisburg (Pa) International 😉