I was lucky enough to get 2 small tables and 1 large table from my Grandparents house. The 2 small tables are in great shape but the large table needs some help. My grandfather made it back in 1953 (he etched the date and his name in it on the bottom). I know I need to sand it but what should I put on it to refinish it? I don't want to ruin the table, it looks to be oak.