Undiluted Resolene on Belt Backs

[superpacker]

I understand that when used as a finish on hair/grain side of leather that Resolene should be diluted to about 50/50. HOWEVER, I always like to treat/seal the backs of belts to create a strong moisture barrier, especially for belts that will be used in workwear/outdoors settings. In that instance, is there any benefit/determent to used undiluted resolene on the back / flesh side? Or should this too be diluted? 

[alpha2]

The main reason I thin Resolene is to keep it from cracking when flexed. Thick coats tend to show the effects of flexing more than a couple, or more, of thin coats. I also buff between coats.

Jeff