I built my dining room table back in 2015 and finished it with Waterlox original (the finish has held up great over the years) but when I made the table I made it with 90 degree edges which tend to dig into your arms when sitting at the table. I want to go back and add a small round over to the top of the table but I am curious about the finish. Will I need to completely sand down the top and refinish it or can I do the round over and then add new finish to the edges?