Make sure when you check te epoxy and paint store's that you ask for the productname of the hardener they use/or sell.
Then lookup in cataloge or internet what the chemical name and supplyer is of the product.

I had no luck either, but when i knew my paintshop had "butanox 50" as hardener and the supplyer was "Akzo Chemical"
a quick search on the net revealed that this was MEKP. It just had another name.

I guess every epoxy shop get'sit products from a supplyer, go get the name of their supplyer and call their sales department.
(fyi; most sales people dont know what MEKP means.)

MEK does not work ( i tried it with noticeable effect)

Try,

[link=http://www.yellowpages.com/SearchResult.aspx?search=Paint%2c Glass %26 Wallpaper Stores&searchfor=Home %26 Garden&state=AK&city=anchorage&zipcode=&areacode=0 &function=Search Category By Id&method=and&adv=6&page=tax&searchcategory=2960&m ercnt=0%2b0%2b0%2b1&buscnt=0%2b0%2b0%2b15[/link]

Benjamin Moore should have what you need for example, or might be able to order it for you.