Let it sit for a few weeks then use an oil based varnish. If you can't wait then wipe it a few times with mineral spirits or Naptha and then proceed...
Yes, a 1/2" blade is all the 14" Delta can tension; even then you can only apply about 12 ksi on it without risk of bending something. I'm surprised...
This is most likely the problem. It happens when I mill lumber on my bandsaw mill if the blade gets duller on one side than the other, especially if...