When we re-stain our deck I just setup a climate controlled room around it. It's basically a bunch of 10mil plastic with a frame made from some modified scaffolding parts. A dehumidifier and then a converted heatpump system keeps the area all around the deck at an even 75 degrees and 10% RH while re-stain things.
The kit was fairly easy to put together, I only have about $20K invested in it. I could send you a set of plans and a price list if you want to build something similar.
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