I don't know if there will be any tannins left to bleed on 100 yr old wood but oil base will block the tannins while latex usually doesn't. Oil base primer generally adheres and seals better than latex primer. If the existing paint is chalky and you can't remove all the chalk you need to either coat it with an oil base primer or add Flood's EmulsaBond to the 1st coat of latex.
Sometimes a latex primer is preferred on old houses that don't have a vapor barrier. Latex will let the wall breath while oil base will restrict moisture passing thru. This can be an issue in the southeast - I don't know if it is in your climate.
Sometimes a latex primer is preferred on old houses that don't have a vapor barrier. Latex will let the wall breath while oil base will restrict moisture passing thru. This can be an issue in the southeast - I don't know if it is in your climate.
