I'm looking to start working with solder paste as I'll be making a batch of SMT boards. It seems that most people use lead-based solder paste that requires refrigeration. Vendors charge a hazardous materials fee that seems to be around $25 plus they will only ship overnight with a cold pack. So if I want just one or two syringes, the shipping can be double the product cost. Plus I have to keep it in a separate refrigerator or at least triple-bag it in my food refrigerator.
But I also see available lead-free synthetic solder paste (like Amtech's SynTECH-LF) that incurs none of the extra charges or special handling, although I'd refrigerate it anyway. I'll likely be using hot air soldering initially and then switch to stenciling and a toaster over. Does anyone have any experience with this synthetic solder paste? How difficult is it to work with?