I would say the MasterKller has one of the nicest reactions to UV...it tends to flouresce a light blue on it's own and really lets the UV dye glow fully.
Not at all impressed by ClearFlex60. I would stay away from it and that Primoflex crap altogether.
For the money it's hard to beat MasterKleer...although it does take a stain from some dyes after a long period of time.
Basically a higher durometer tends to have less Plasticizer leech too. The same stuff that makes Primo and ClearFlex so soft and flexible is the same stuff that makes for LCS smegma...
Bookmarks