We stained our deck a year ago and we've had a major issue with what I think is sap bleeding through the white stain. The deck is about 4 years old and had never been stained so we went through the process of prepping the deck beforehand. We were just going to stain right over top of the yellowish parts again, but we did a test area first and the same thing happened. Rather than redo everything with the same result, does anyone have any tips and thoughts about what is going on here? This is the North side of the house so it does not get a ton of sunlight...
I've put a couple of pictures so you could see what I mean. Hopefully the work when you paste them in your web browser.
All the best,