HELP> our hemlock pine home in sw pennslyvania is about 33 years old and in need of exterior cleaning staining, ect.. we hired a co, they used mixture of bleach & tsp and pressure washed entire house looks beautiful, then they used cedar dynamite caulk, also looks beautiful, PROBLEM when they started to brush on SIKKENS SRD in NATURAL OAK it is turning all the beautifull honey oak colored wood to an UGLY DARK BROWN/BLACK…what do we do?
Sounds like a chemical reaction from the bleach and TSP mixture. They probably didn’t rinse it enough to neutralize it and get the PH correct in the wood fiber. It could also be that this is just the color this stain is going to be on the Hemlock. You can put a stain on 3 different woods and get 3 different colors.