I did a couple of ULFF searches for "Bergman" and "floatant" and didn't get any results on Ray Bergman's floatant recipe from his great book, Trout. I've tried his recipe and for a few pennies' worth of paraffin dissolved in the remnant of a can of Coleman fuel, I have enough floatant to last years. After dipping a fly into the solution contained in a small wide-mouthed bottle with a leak-proof cap and shaking, then shaking the excess solution off the fly using the VERY effective
rubber band fly dryer I found in this The Frugal Fly Fisherman forum, it floats like a cork;
better than any floatant I've ever used.
Here is a link to an article referencing Bergman's floatant recipe in the book showing a test comparison with commercially available products
http://www.drlogik.com/flyfloatants.html2 ounces of paraffin dissolved in 1 pint of non-leaded gas
However I have found two *three* disadvantages to this floatant recipe.
The first is it congeals below 60° fahrenheit. So you can either carry it in a tightly sealed bottle inside a shirt or jacket pocket or I've heard that a little less paraffin in the mix will help.
The second disadvantage is
it's an extremely flammable mixture. Smoking a pipe, cigars, or cigarettes...
when treating your fly would be a bad idea, but I'm a non-smoker.
*The third disadvantage is I have not been able to find a larger jar to mix and store a batch of floatant or a small bottle to carry with me that seal well enough to keep the Coleman white gas from evaporating for longer than just a couple of weeks.*