I've only used the fast harder. I agree it is clear and thin enough to go on easily. Happy working temperature seems to be in the 60 - 65 degree range. Don't let your shop creep up to 80 degrees unless you want a real workout. No problem with blush yet, can manage three coats in a day with it. Crystalizes in cold at warmer temperatures than West System or System 3. Overall I like it and will continue using it. Next favorite would be System 3.
good luck
don

: I am considering using Raka epoxy on my latest stripper and wanted to find
: out others' thoughts on the different hardeners Raka sells. This is a
: clearcoat job. I would appreciate comments on others' experiences.

: Thanks
: Jim