Two days of rain destroyed the finish.  The wood swelled and cracked.  I bought a cover, which was evidently needed to begin with, and have just spent two days refinishing the table. What was left of the finish came off with 30 seconds' sanding, showing that it was never properly stained or sealed. What is more, the bolts have to be constantly retightened and the feed keep falling off, because they are screwed into the bare soft wood.