I use the water based Renia Aquilim 315 and Aquilim SG, and i'm happy with those two. But in some situations i need a solvent based glue, one example is if i line something without glue (Like this card case i did a while ago, and i used Colle de Cologne to glue the lining.) But i have a hard time to decide a solvent based glue. I have most of Renias glues (Suitable for this type of work) , and i have tried them on veg tan and chrome tanned leather, and i think they behave very similar. But i wan't the most versatile glue, i guess some of those solvent based glues are better on oily leather and so on. I would appreciate some help to choose one of those. I would prefer to have two glue pots. One with water based (Aquilim 315) and one with a solvent based glue. And aquilim SG i can use directly from the can, since it's easy to rinse the brush in water afterwards. (I use SG for paddings on watch straps, and i guess it would be a good choice for zippers in the future, since it has an instant bond, but it's a temporary bond. It bonds to almost everything, flesh to grain, i even glue paddings to my granite plate så i can shape it easier.