Q: My daughter had her floor sanded and recoated. After the first two coats everything looked great. The contractor said he wanted to add a 3rd coat so they said okay. After the 3rd coat yellow streaking showed up when it was dry. Mostly at all the seams. Why would this happen?
A: I would say they have used a water borne coating. Who is the manufacturer of the finish? Perhaps this is a tannin reaction.