Hi All,
MEK and MEKP are not the devil in liquid form. They are not carcinogenic. MEK is similar Acetone, it is part of the same chemical family, aliphatic ketones. MEK is useless as an ignition improver in diesel fuel. On the other hand MEKP has the ability of lower the ignition temperature of fuel by generating of free radical in combustion camber.
MEKP is a little more hazardous to work with. If you get it in your eyes it will do a lot of damage to them. So all ways ware safety glass when handling it. MEKP can be explosive! If highly concentrated or pure it can be detonated in the right conditions. The diluted solution can be handled safely without problems. MEKP can be prepared from MEK by oxidation with hydrogen peroxide and a little sulfuric acid. I have done this may times. I don't recommend anyone try this unless they are an experienced chemist . By experienced chemist I mean 5-10 year lab experience. No Mixing your own diesel model fuel isn't lab experience and high school chemistry lab sessions don't count either .
But then why go to all that hassle you can buy it at your local hardware store for a few dollars. It is sold in usually in 30-60% solution as resin catalyst. Diggers is my favorite brand, 20ml cost about $AUS 7.00.
If you want to experiment with MEKP this is the way to go.
Hope this clears a few things up.