I get it from Mudhole.com. It's pretty cheap in the bigger sizes; you can get 32 ounces for $45 and that will last for a long time.
I've found it necessary to use U-40 Color Lock before top-coating with U-40 LS Supreme medium build. You will get fish eyes with LS Supreme medium build unless you use Color Lock first. I found that out the hard way... :-X
The only other downside to using LS Supreme is that it takes 24 hours to dry tack-free, and up to a week to fully cure. It cures faster at warmer temperatures, but it still takes five days to reach full strength.
Ok i may have to look into that. Thanks for the info
Roby