Varnish over old wallpaper glue
Hoping someone out there has dealt with this before. I have exposed some 100+year old hand-sawn beams in a ceiling I am redoing. They are 3"×9" and beautifully imperfect. I am planning to leave them exposed and putting a polyurethane stain on them. HOWEVER some where in the last century they were (no doubt very stylishly) papered over. I would say wall paper but that may be too generous. I've removed the paper and scrubbed them with soap and water. I know there is still glue (possibly just flour and water paste) on them. How will the residue effect the poly coat.... and if it will effect it what would your recommendations be for pretreatment? they are still holding up the ceiling and surrounded by adobe and sheetrock walls. Floor is going to be redone later so I don't care about protecting it.