We were lucky enough to recently inherit a Rainbow Sunray play system from our friends. It could use a fresh coat of stain and I'm not sure if there's something special from Rainbow that I should use or if there's something comparable (and less expensive) that I should just pick up from the hardware store or somewhere. I'd appreciate some quick guidance because I'd like to get a coat of stain on the wood roof before we attach it back on the system (from having just moved it) but until then the roof pieces are just sitting on my lawn and I'd like to keep that situation pretty temporary. Thanks!