Methyl Ethyl Ketone is bad stuff. I remember when my ship (a submarine tender) went through a yard period at Newport News in 1965. They had cleaned, dried and sandblasted the potable water tanks, and then one night they cleared everyone off the ship and sprayed some epoxy type coating in them, using MEK as a solvent. I think they kept us off the ship until the next night until the air sampling folks were satisfied that re-entry on board was safe. The smoking lamp was definitely out for a big radius around the ship.