MEK in an Epoxy surface coat will just make a huge mess!
MEK is for polyester resin, totally different from an epoxy resin hardener.
Are you using PTM&W 1105 epoxy surface coat? I ask because that is the mix ratio for it. It is listed as resin to hardener @ 100:11 BY WEIGHT. Like Wyowindworks said, make sure it is by weight or volume before you mix, or you will not like the results. [
] I would look real good on the cans, as well as the product information sheets for the mix ratio. If all else fails, give the company a call and they will be glad to answer the question for you.