Hi! I worked really hard in sanding staining and finishing two giant Adirondack chairs. I put a coat of polyurethane on them thinking I would just do three coats until I read it was for “indoor use only”. So currently I have only one coat of polyurethane. These chairs HAVE TO GO OUTSIDE. They don’t even fit in the doors to go in my garage. Do I keep going? Try to sand everything off? The nooks and crannies where I put the poly- there’s no way to get it all off. Can I spray a waterproofing over it now? What do I do!? Help! Please and thank you!