Seal Hardwood easiest way ???

[Utey]

In the process of building house have two hardwood beams nailed together.
Yesterdays rain and tannin started to leach out .
Need to seal so tannin doesn't stall concrete walls and floor
Can only seal some of beam because rafters etc are already nailed in place.
Any thoughts

Nick

[ian]

cover the floor and walls with a disposable liner until the roof goes on and the beams are protected from the weather.