F.H.
It sounds like solid oak. It will warp and leave a ring if you get it wet. And the only way to "fix" it is to sand it down and repaint it and make sure it it sealed with a WATERPROOF sealant. If not, you need to be dilligent about using coasters under cups and hot pads and place mats. Also using a plastic table cloth or a plastic one UNDER a regular one will help too. But to fix the table you have, it will probably be cheaper to just get a new one. Or you could try to match the red, and repaint it yourself or hire someone that knows how to to. Good luck!!!