Originally posted by robtcorl "2-Pentanone or methyl propyl ketone (MPK) is a ketone and solvent of minor importance. It is comparable to methyl ethyl ketone, but has a lower solvency and is more expensive.[3] It occurs naturally in Nicotiana tabacum (Tobacco)[4] and blue cheese as a metabolic product of Penicillium mold growth.[5]"
So you're cleaning planes with tobacco juice and blue cheese?
No wonder they smell funky.
Believe me, it doesn't smell like tobacco or moldy cheese.
In fact the MSDS advises against inhaling the vapors, and requires adequate ventilation.
We used to use MEK, but switched to MPK because it evaporates less quickly, creating lower evaporative emissions.