I have used a mixture of 50/50 Mop&Glo/Water in place of same ratio of Resolene/Water on a few projects, 2 layer belts and holsters. Comparing both over a few months of use, I'm not seeing much, if any, difference in wear, abrasion, flexibility or toughness. I was talking with a Tandy rep and he believed Mop&Glo contains ammonia which will break down the leather over time. I checked MSDS on it and did not see ammonia listed, just Poly. Resolene on the other hand contains Ammonium Hydroxide. Not trying to get into the chemistry of it, because I wouldn't understand that anyways, just wondering if anyone has run into any long term ill effects of using it. Applying both in a similar manner with a wet sponge applicator, the Mop&Glo goes on easier and almost zero bubbles, where as the Resolene produces more bubbles to smooth out and a longer time to work with it.