I have a little question about sealing my MDF workbench top. I recently watched a episode of The Woodsmith Shop about building a "weekend workbench". It looked pretty good and strong and I've been meaning to get a good workbench for a while so I downloaded the plans and built it, (front vise, dog holes and all). It turned out great (big and heavy). Well, at the end of the program Don, the founding editor, is applying some kind of sealent to the top. He didn't say what it was just called it a " regular rubbing oil". He said it was to keep glue from sticking to it and to keep it clean. Has anyone else built this workbench? And if so, what, if anything did you use to treat the top? I don't want anything that is going to make it swell or blister. Anyone have any suggestions?