Does anyone here have experience with the Daler-Rowney System 3 inks? The studio I'm currently in uses them and I think I just discovered that they aren't waterproof (or at least the base isn't, eek!). In the middle of sourcing some less problematic inks, but in the meantime I'm wondering if there is some kind of activator I can add to make them permanent, or if the pigments would be compatible with the Speedball permanent acrylic base. Cheers.