The prep on my 100 year old bungalow has taken far longer than I expected. I have sc****d down to the wood on much of two exterior walls. The problem is that it is now January and rain is expected in 3 days! Does that exposed redwood need to be washed before I primer? It was been cold (50s) and dry for the last month. Would it be better to leave the wood exposed until the spring, or risk poor adhesion due to moisture or uncleaned surfaces?