For Flex Coat users who have used both the high build and lite formulas, how would describe the self leveling properties of each?

All finishes are self leveling, it doesn't make any difference what brand it is.
As for high build it is a little thicker constancy than the light, which lets you put it on a little heaver than the light formula.
As with all finishes two light coats are better than one heavy coat for constant finishes, there are exceptions to every rule.
Remember that getting down a measuring, mixing, and application method that remains the same from rod to rod will get you the best results, it is when you try to change your method, is when you run in to problems. Changing from one brand to another, you will have to figure out a new measure, mix and application method.

Exactly what Tim said. Pick a product, learn it's quirks and stick with what works.

Ditto. They all seem to work similar but each has its own unique qualities that you only get to know after working with it. I still use FC High mostly but when working with white thread I use Threadmaster.

Pour out some of each onto a flat surface and watch what happens - both level perfectly. There is no difference between any of the popular epoxies in terms of self leveling abilities - they're all the same.

If you get lumps and bumps, hills, valleys, etc., it's usually because you're apply too much at one time. Read the article in the online library about finishing for more information.

Thinner finishes generally require thinner applications and thicker ones can withstand thicker applications.

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With FC I use heat. When heat is applied the globes well form where there is a over abundance of finish. I use a brush to wick this off on to the low side. While the finish is turning look at the under side you well see your waves. You can fill in the low spots with new finish or drag the high side over and fill the low spots. . By looking at the finish from the underside you can see how level your finish well be.
Good Wraps Bob

Thanks for all of your comments.

So far all the light brands I have tried level very well I dont think they could do othrwise since they are so thin. The thick versions is where most will run into problems they hold bubbles longer and sometimes will not release, will lump and bump and do all kinds of funny stuff if the user applies it incorrectly. One thing I can tell you of the heavies Flex Coat heavy is one of the best for self leveling properties without needing much help.

I agree Henry on that point. When using Flex Coat and it starts to thicken you can use heat to re-liquify it. DOWN SIDE you have to be fast smoothing it out NO secound chances.
Good Wra[s Bob