I did a little experiment this time before I stained. I used a cotton bud to give the binding a coat of wipe on poly before I finished sanding. Apart from one little slip around an f hole I was able to keep it of the wood. I’ve still got stain in some larger binding cracks, but it doesn’t seem to of bleed into the smaller hairline cracks like I’ve seen before. Then again the binding might just be in better condition and I’m just kidding myself.
After two coats of poly the stain is sealed in. A little bit of colour dragged over the purfling so I’ve given it one last scrape. Only poly coat/wet sanding record keeping from now on for a while.